Elevance® Chair Troubleshooting Charts

Symptom Cause Check Action
Chairs prior to Serial Number V2475009 - No relays can be heard energizing.

Chairs after Serial Number V2475010 - No command is executing.

 Power issue If green light on the chair base is illuminated, it indicates that the chair has power. Connect chair to power if light is off.
Is facility circuit breaker tripped? Determine why breaker tripped. Correct issue and reset breaker.

Fuse(s) F1, F2, or F3 on Chair PC Board are blown or open.

Refer to: Elevance® Dental Chair Lift Mounted Components for fuse Part numbers.

 Replace bad fuses.
Wire connections are loose. Tighten loose connections.
Verify line voltage at J3 connection on the chair control PC Board. Refer to: PC Board wiring diagram to determine loss of power at J3.
If using a wireless remote. Power issue Check batteries Replace depleted batteries with new ones.
Check battery leaf-spring contacts to ensure that they make good contact with battery. Refer to: battery contacts illustration.
Chair has power, but control buttons still do not operate chair. Chair is in calibration mode. Is SW2 Program Switch #4 ON? The wireless remote has an override feature - press and hold the P button and any arrow. This feature allows chair movements that override the software controlled movements. This moves the chair whenever it is powered. Move SW2 program switch #4 to OFF. Cycle power (plug then unplug power source to the chair).
Chair has not been calibrated. Refer to: Chair Calibration procedure. Calibrate Chair.
Loose connections. Check all connections and harnesses. Repair or replace malfunctioning connector(s) or wire harnesses. Refer to: PC Board wiring diagram for part numbers of harnesses.
If LIN Coupler is used to connect Assistant’s Unit keypad. Refer to: Verifying LIN connections. Restore LIN components functionality.
Chair PC Board is malfunctioning. Chairs prior to Serial Number V2475009 - Incoming line voltage is present at J3 connector on Chair PC Board. LED is not ON next to the related relay when the function is operated.
Chairs after Serial Number V2475010 - Incoming line voltage is present at J3 connector on Chair PC Board. LED is not ON next to the related triac when the function is operated.
 Replace Chair PC Board.
Some functions work with control buttons, but at least one function does not. Safety bail limit switch contacts open on one or both limit switches or on the cuspidor limit switch (J6). LED D17 on Chair PCB. is ON when limit switch contacts are CLOSED. Limit switches are wired in series with each other and prevent the chair from going down. Remove obstacle causing switch to open or replace malfunctioning switch(es).
Broken wires or loose connections. Verify continuity on all harnesses. Repair or replace loose connectors or broken harnesses
Remote control or foot control.

Perform a continuity check on each switch. Depressing a key on a touchpad closes the switch. Look at the parts pages for the Remote or Foot control devices used on your chair. Refer to:

Elevance Chair Wireless Remote and Base Antenna

Elevance Chair Foot Control Assembly

If a switch does not show continuity when depressed to the closed position, then replace the remote control or foot control.
Capacitor for the hydraulic motor pump. If hydraulic UP functions do not work, then verify the capacitor for the hydraulic motor pump by replacing it with a known good capacitor of the same rating. Replace malfunctioning capacitor.
Chair PCB Chairs prior to Serial Number V2475009 - Incoming line voltage is present at J3 connector on the Chair PCB. LED is not ON next to the related relay on the Chair PCB when the function is being operated. Check visually for damaged components or broken traces on PCB.
Chairs after Serial Number V2475010-Incoming line voltage is present at J3 connector on the Chair PCB. LED is not ON next to the related triac on the Chair PCB when the function is being operated. Check visually for damaged components or broken traces on PCB.		 Replace malfunctioning Chair PC Board.
Back or base position sensor is open or shorted out. Check connectors. Check continuity on all harnesses for broken wires or loose connections. Repair faulty connector(s). Replace harness(es). Replace back or base positioning sensor.
Symptom Cause Check Action

Nothing happens when any Back Up button is depressed.

All other functions work properly.

 Loose connections Check for broken wires and loose connections for Back Up solenoid J1 on Chair PCB. Repair or replace harnesses or connections.
Open coil on the Back Up solenoid valve. Replace hydraulic solenoid valve assembly.
Back Up solenoid valve is stuck in the closed position or clogged.
Throttle valve (TV3) turned in too far or closed on hydraulic solenoid valve assembly. Travel time from end point to end point should be 15 seconds +/- 1 second with 180 lbs. (82 kg) on chair. Adjust TV3 throttle valve.
Hydraulic back cylinder leaks while using chair. Replace cylinder.
Potted back tilt sensor connection is loose or harness is broken. Tighten connection or replace potted back tilt sensor.
Potted back tilt sensor is damaged (open or shorted). Replace potted back tilt sensor.
Line voltage not present at J1 terminals 1 and 2 to Back Up solenoid. Chairs prior to Serial Number V2475009 - On Chair PCB, LED D12 by K4 relay should be ON.
Chairs after Serial Number V2475010- On Chair PCB, LED D12 by U17 triac should be ON.		 Replace Chair PC Board.
Symptom Cause Check Action

Nothing happens when any Back Down button is depressed.

All other functions work properly.

 Obstructions contacting the covers or cuspidor, if applicable. Which limit switch is activated. Remove obstructions.
Safety bail limit switches. Verify switch connections are secure and on the correct terminals. If a cuspidor is not installed a jumper must be in place on J6 on Chair PCB. The normally closed safety bail limit switches open when the chair back or shrouds are deflected and the actuator bracket moves away from the switch. Connect harnesses correctly and verify that a jumper is on J6 if there is no cuspidor.
Cuspidor safety limit switch. Verify connections on cuspidor safety limit switch are secure and on correct terminals. The normally open cuspidor safety limit switch is tripped closed with cuspidor in normal operating position. The switch opens when cuspidor is deflected. Connect harnesses correctly.
Throttle valve (TV4) turned in too far or closed. Travel time from end point to end point should be 15 seconds +/- 1 sec with 180 lbs. (82 kg) on chair. Adjust TV4 throttle valve.
Back Down solenoid coil. Back down solenoid coil has an open winding, is disconnected or has a broken lead. Repair wires and connections.
Back down solenoid valve is stuck. Back down solenoid valve is stuck in closed position or is clogged, preventing hydraulic fluid to flow back into reservoir. Replace hydraulic solenoid valve assembly.
Potted back tilt sensor. Connection is loose or harness is broken. Tighten connection or replace potted back tilt sensor.
Potted back tilt sensor is damaged. Potted back tilt sensor is open or shorted. Replace potted back tilt sensor.
Faulty PCB Chairs prior to Serial Number V2475009 - LED D11 by K3 Relay should be ON. Line voltage should be present at J1 terminals 3 and 4 to Back Up solenoid.
Chairs after Serial Number V2475010- LED D11 by U19 Triac should be ON. Line voltage should be present at J1 terminals 3 and 4 to Back Up solenoid.		 Replace Chair PC Board.
Back lower spring is detached or broken. Back is designed to lower from top to bottom in 20 seconds with 85 lbs (39 kg) load. If detached, then reattach. If broken, replace both springs.
Symptom Cause Check Action
Nothing happens when any Base Up button is depressed. All other functions work properly. Broken wires or loose connections. Connections at Base Up solenoid and at J1 on Chair PCB. Repair or replace harnesses or connections.
Base Up solenoid valve. Open coil on the Base Up solenoid valve. Replace hydraulic solenoid valve assembly.
Base Up solenoid valve is stuck. Base Up solenoid valve is stuck in the CLOSED position or clogged, preventing hydraulic fluid flow.
Throttle valve (TV1) turned in too far or closed. Travel time from end point to end point should be 20 seconds +/- 1 second with 180 lbs. (82 kg) on chair. Adjust TV1 Throttle Valve.
Hydraulic back cylinder leaks while using chair. Replace cylinder.
Chair PC Board. Chairs prior to Serial Number V2475009 - LED D10 by K2 Relay should be ON. Line voltage should be present at J1 terminals 3 and 4 to Back Up solenoid.
Chairs after Serial Number V2475010-LED D10 by U8 Triac should be ON. Line voltage should be present at J1 terminals 3 and 4 to Back Up solenoid.		 Replace Chair PC Board.
Symptom Cause Check Action

Nothing happens when any Back Up button is depressed.

All other functions work properly.

 Obstructions contacting the covers or cuspidor (if applicable). Which limit switch is activated. Remove obstructions.
Safety bail limit switches. Verify switch connections are secure and on the correct terminals. If a cuspidor is not installed a jumper must be in place on J6 on Chair PCB. The normally closed safety bail limit switches open when the chair back or shrouds are deflected and the actuator bracket moves away from the switch. Connect harnesses correctly and verify that a jumper is on J6 if there is no cuspidor.
Cuspidor safety limit switch. Verify connections on cuspidor safety limit switch are secure and on correct terminals. The normally open cuspidor safety limit switch is tripped closed with cuspidor in normal operating position. The switch opens when cuspidor is deflected. Connect harnesses correctly.
Throttle valve (TV2) turned in too far or closed. Travel time from end point to end point should be 20 seconds +/- 1 sec with 180 lbs. (82 kg) on chair. Adjust TV2 throttle valve.
Base Down solenoid coil. Base down solenoid coil has an open winding, is disconnected or has a broken lead. Repair wires and connections.
Base down solenoid valve is stuck. Base down solenoid valve is stuck in closed position or is clogged, preventing hydraulic fluid to flow back into reservoir. Replace hydraulic solenoid valve assembly.
Faulty PCB Chairs prior to Serial Number V2475009 - LED D9 by K1 Relay should be ON. Line voltage should be present at J1 terminals 1 and 2 to Base Down solenoid.
Chairs after Serial Number V2475009-LED D9 by U15 Triac should be ON. Line voltage should be present at J1 terminals 1 and 2 to Base Down solenoid.		 Replace Chair PC Board.
Symptom Cause Check Action
Nothing happens when any Base or Back Down buttons are depressed. All other functions work properly. Obstructions contacting the covers or cuspidor (if applicable). Which limit switch is activated. Remove obstructions.
Safety bail limit switches. Verify switch connections are secure and on the correct terminals. If a cuspidor is not installed a jumper must be in place on J6 on Chair PCB. The normally closed safety bail limit switches open when the chair back or shrouds are deflected and the actuator bracket moves away from the switch. Connect harnesses correctly and verify that a jumper is on J6 if there is no cuspidor.
Cuspidor safety limit switch. Verify connections on cuspidor safety limit switch are secure and on correct terminals. The normally open cuspidor safety limit switch is tripped closed with cuspidor in normal operating position. The switch opens when cuspidor is deflected. Connect harnesses correctly.
Symptom Cause Check Action
Nothing happens when any Base or Back Up buttons are depressed. All other functions work properly. Hydraulic motor pump thermal overload.

Check continuity between white and red motor leads and then between yellow and red motor leads. If no continuity - let motor cool 10 minutes or more and recheck.

Hydraulic pump operates intermittently. Running the motor continuously for a 30 second period will cause the overload to open.

If overload remains open or no continuity registers. Replace hydraulic motor pump.

Hydraulic oil in reservoir is low. Hydraulic fluid in oil reservoir is low. Fill oil reservoir to correct level.
Hydraulic motor pump leads are disconnected or loose. Refer to: PC Board wiring diagram. Connect electrical leads properly.
Capacitor on hydraulic motor pump weak or inoperative. Replace capacitor with a known good capacitor of same voltage and manufactured rating.
Line voltage to chair is low. Line voltage should be between 110.0 to 126.0 VAC on a 115 VAC unit or 220 to 252 VAC on a 230 VAC unit. Correct low line voltage at source.
Pressure relief valve. Pressure relief valve is open or leaking. Replace pressure relief valve.
Symptom Cause Check Action
Base cylinder piston seals are leaking. Excessive hydraulic fluid is returning to reservoir through the vent tube of base cylinder. Replace base hydraulic cylinder.
Symptom Cause Check Action
Back cylinder piston seals are leaking. Excessive hydraulic fluid is returning to reservoir through the vent tube of back cylinder. Replace back hydraulic cylinder.
Symptom Cause Check Action
Hydraulic Motor Pump keeps running Loose connections at Chair PCB Potted back tilt sensor connection is loose on chair PC Board (J13) Tighten connection at J13.
Potted back tilt sensor is malfunctioning. Replace potted back tilt sensor.
Symptom Cause Check Action
Chair moves slowly or not at all under heavier loads Line voltage supplied to chair is too low. Check supply line voltage at source. Should be between 110.0 to 126.0 VAC on 115 VAC units or 220 to 252 VAC for 230 VAC units. Correct low line voltage at source.
Weak capacitor on hydraulic motor pump. Replace capacitor with a known good capacitor of same voltage and manufactured rating.
Patient weight exceeds maximum limitation of 450 lbs. (204 kg).   Follow maximum weight limitations.
Hydraulic fluid is leaking past hydraulic pressure relief valve. Excessive fluid is flowing back to reservoir during operation. Replace hydraulic solenoid valve assembly.
Hydraulic cylinder(s) leaking past piston seals Excessive fluid returning to oil reservoir thru vent tubing. Replace hydraulic cylinder(s).
Symptom Cause Check Action
Base Lowers too slowly The TV2 Throttle valve setting controls hydraulic oil flow for the base down movement. Travel time from end point to end point should be 15 seconds +/- 1 sec with 180 lbs. (82 kg) on chair. Turn TV2 Throttle valve CCW
Base Lowers too quickly Turn TV2 Throttle valve CW
Symptom Cause Check Action
Back Lowers too slowly The TV4 Throttle valve setting controls hydraulic oil flow for the base down movement. Travel time from end point to end point should be 20 seconds +/- 1 sec with 180 lbs. (82 kg) on chair. Turn TV4 Throttle valve CCW
Back Lowers too quickly Turn TV4 Throttle valve CW
Back down travel is too slow or too fast Back lower spring is detached or broken. Back is designed to lower from top to bottom in 20 seconds with 85 lbs. (39 kg) load. Reattach or if broken, replace both springs.
Symptom Cause Check Action
Noisy during Back or Base Up Restriction in suction line from oil reservoir resulting in some cavitation. Check for kinks in tubing and restrictions in suction line. Repair or replace tubing.
Internal part failure in hydraulic motor pump. Replace hydraulic motor pump.
Symptom Cause Check Action
Headrest does not stay in position Friction cam adjustment not set correctly. Friction cam mechanism. Reset the friction cam mechanism.
Symptom Cause Check Action
Heat light blinks Loose connections. Connection plugs on SerenEscape control box. Secure connection(s).
Loose connection or bent connector pins. Verify the red cable is connected in the upholstered back.

Wrap connections with electrical tape in a figure 8 pattern. Straighten bent pins.

Upholstered back, remote control or control box issues. Connections at both ends of the SerenEscape power supply. Replace upholstered back, remote control or control box, in this order.
Power light blinks Power supply voltage is incorrect. Power supply voltage should be between 10 - 14 VDC. If voltage is incorrect, replace SerenEscape power supply.
One or both massage motors do not operate Loose cable connections. Black cable connections in the upholstered back. Secure black cable connections with electrical tape wrapped in a figure 8 pattern.
Symptom Cause Check Action
Brake LEDs on Chair PC Board:
D2 on - indicates switch (pedal) activated
D17 on - indicates solenoid activated.		 Wiring issues. Press brake release pedals individually. If LED D2 does not turn on. Repair connections or replace harness.
Physical obstruction at the brake pin or a missing/broken spring.

Press brake release pedals individually. If LED D15 turns on, then verify you can hear the solenoid energize.

If LED D15 does not turn on, then test brake solenoid (J16) by moving plug to AUX (J2) on the PC Board - a good solenoid will energize immediately. Do not leave it plugged in for more than a few seconds to test it.

 Remove obstruction or replace spring.
Rotational brake will not unlock. Loose connections or short in brake solenoid harness to J16 on Chair PCB. Repair connections or replace harness.
Continuity on brake solenoid coil. Verify continuity on brake solenoid coil. If coil shows open continuity, then replace solenoid.
Rotational brake will not lock. Missing or broken spring. Spring attached to brake lever arm. Replace spring.
Symptom Cause Check Action
Brake LEDs on Chair PC Board:
D2 on - indicates switch (pedal) activated
D17 on - indicates solenoid activated.		 Switch or wiring issues. Press brake release pedals individually. If LED D2 does not turn on. Repair connections or replace harness.
Physical obstruction at the brake pin or a missing/broken spring.

Press brake release pedals individually. If LED D15 turns on, then verify you can hear the solenoid energize.

If LED D15 does not turn on, then test brake solenoid (J16) by moving plug to AUX (J2) on the PC Board - a good solenoid will energize immediately. Do not leave it plugged in for more than a few seconds to test it.

 Remove obstruction or replace spring.
Rotational brake will not unlock. Loose connections or short in brake solenoid harness to J16 on Chair PCB. Repair connections or replace harness.
Continuity on brake solenoid coil. Verify continuity on brake solenoid coil. If coil shows open continuity, then replace solenoid.
Brake solenoid to brake cylinder linkage. Check linkage between brake solenoid and Brake Cylinder. Repair/Replace linkage.
Brake Cylinder not releasing. Manually release brake (step on pedal) and try to rotate chair. Replace brake cylinder if you cannot rotate chair.
Rotational brake will not lock. Brake Cylinder not locking. With brake locked (pedal up) try to rotate chair. Replace brake cylinder if you can rotate chair.
Symptom Cause Check Action
Brake LEDs on Chair PC Board:
D2 on - indicates switch (pedal) activated
D17 on - indicates solenoid activated.		 Switch or wiring issues. Press brake release pedals individually. If LED D2 does not turn on. Repair connections or replace harness.
Physical obstruction at the brake pin or a missing/broken spring.

Press brake release pedals individually. If LED D15 turns on, then verify you can hear the solenoid energize.

If LED D15 does not turn on, then test brake solenoid (J16) by moving plug to AUX (J2) on the PC Board - a good solenoid will energize immediately. Do not leave it plugged in for more than a few seconds to test it.

 Remove obstruction or replace spring.
Rotational brake will not unlock. Loose connections or short in brake solenoid harness to J16 on Chair PCB. Repair connections or replace harness.
Continuity on brake solenoid coil. Verify continuity on brake solenoid coil. If coil shows open continuity, then replace solenoid.
Side load on chair. Is a side load present on chair. Remove Side Load.
Rotational brake will not lock. Solenoid Assembly not over-torqued. Check if Solenoid Assembly is over-torqued at Brass Fitting to chair. Loosen and adjust torque to 13-18 FT Lbs.
Pin movement is obstructed. Check for debris obstructing pin movement in the Solenoid Assembly. Remove, clean and reinstall.
Symptom Cause Check Action
Brake LEDs on Chair PC Board:
D2 on - indicates switch (pedal) activated
D15 on - indicates solenoid activated.		 Switch or wiring issues. Press brake release pedals individually. If LED D2 does not turn on. Repair connections or replace harness.
Physical obstruction at the brake pin or a missing/broken spring.

Press brake release pedals individually. If LED D15 turns on, then verify you can hear the solenoid energize.

If LED D15 does not turn on, then test brake solenoid (J16) by moving plug to AUX (J2) on the PC Board - a good solenoid will energize immediately. Do not leave it plugged in for more than a few seconds to test it.

 Remove obstruction or replace spring.
Rotational brake will not unlock. Loose connections or short in brake solenoid harness to J16 on Chair PCB. Repair connections or replace harness.
Continuity on brake solenoid coil. Verify continuity on brake solenoid coil. If coil shows open continuity, then replace solenoid.
Side load on chair. Is a side load present on chair. Remove Side Load.
Rotational brake will not lock. Solenoid Assembly not over-torqued. Check if Solenoid Assembly is over-torqued at Brass Fitting to chair. Loosen and adjust torque to 13-18 FT Lbs.
Pin movement is obstructed. Check for debris obstructing pin movement in the Solenoid Assembly. Remove, clean and reinstall.