PowerMax Troubleshooting Chart

Problem	Probable Cause	Correction
Low Suction in Operatories	Pump filters dirty.	Replace filters.
	Vacuum lines plugged, damaged or collapsed.	Repair lines.
	Pump vanes sticking.	Clean pump with Midmark® flushing solvent.
	Pump vanes worn.	Replace vanes.
	Vacuum switch "off" point set too low.	Adjust vacuum switch.
	Disposable collection canister in operatory full.	Replace canister.
High Vacuum Level at PowerMax	Pump filters dirty.	Replace filters.
	Vacuum lines plugged, damaged or collapsed.	Repair lines.
	Vacuum switch "on" point set too high.	Adjust vacuum switch.
Pump overheats - Operating Temperature measured at pump Exhaust is 180 degrees Fahrenheit or Higher	Pump filters dirty.	Replace filters.
	Vacuum lines plugged, damaged or collapsed.	Repair lines.
	Exhaust muffler dirty or exhaust piping plugged.	Remove and clean metal exhaust muffler. Disassemble, inspect and clean exhaust system as necessary. Verify outside exhaust vent is open.
	Dirt buildup in pump chamber.	Clean pump with flushing solvent.
	Pump vanes worn.	Replace vanes.
	Excessive ambient temperature in equipment room.	Check that installation site is properly vented and, if necessary, air conditioned to prevent ambient temperature from exceeding 104 degrees Fahrenheit.
PowerMax Cycles with No Vacuum Being Used	Pump check valve's leaking.	Clean or replace check valve.
	Leak in PowerMax or piping system.	Check for leaks by allowing PowerMax to reach 20 Hg and shut down. Close the receiver tank inlet valve to isolate unit from piping system. Do not use any vacuum from piping system for several minutes. If the vacuum gauge continues to drop while inlet valve is closed, the leak is within the unit. If the vacuum gauge maintains the same reading, but drops after opening the inlet valve, the leak is in the piping system.
Motor Overheats; Thermal Overload Shuts Down Motor See Warning at beginning of Troubleshooting Table	Motor overloaded due to problem with vacuum pump.	See " Pump Overheats"
	Motor bearings defective. Listen for noisy bearings.	Return unit to Midmark® for repair.
	Motor dirty.	Clean / vacuum motor vents.
PowerMax runs but there is no suction in the operatory.	PowerMax inlet ball valve closed.	Open inlet ball valve.
	Open or damaged vacuum piping.	Repair Vacuum lines.
	Tank drain valve open.	Close drain valve.
PowerMax will not run	Service switches in PowerMax electrical box in "Off" position.	Each PowerMax pump has its own on-off switch. Verify that each switch in the electrical box is in the "On" position.
	Electrical Component is not working properly.	Check Line Voltage.
	Fuse blown.	Check fuse.
	Low Voltage.	Check Low Voltage.