Installation Manual

10
troubleShooting
Symptom Possible Cause Possible Solution
Unit will not turn on 1. Power cord not plugged in.
2. Bad power outlet.
3. Unit is in high-pressure shut-off.
4. Motor is in thermal overload.
5. Circuit breaker tripped.
1. Check power cord at wall and unit.
2. Try a different outlet.
3. Reduce head pressure to below
400 psi (27.6 bar).
4. Allow motor / unit to cool down.
5. Check / reset circuit breaker.
Compressor tries to
start, but just buzzes
1. Low voltage at power source.
2. Extension cord too long, or too
small.
3. Head pressure too high.
1. Locate / use better outlet.
2. Reduce length of extension cord.
Increase size (gauge) of extension
cord (14 AWG minimum).
3. Reduce head pressure. Turn inlet
valve slightly past closed toward
PURGE to equalize high-side / low-
side pressure.
Unit pumps into high-
pressure shut-off
1. Output valve on unit is closed.
2. Recovery cylinder valve closed.
3. Head pressure too high.
1. Check output valve.
2. Check recovery cylinder valve.
3. Check output hoses for restrictions
or kinks. Reduce head pressure.
Slow recovery 1. Trapped liquid in system.
2. Restriction in refrigerant ow path.
1. Momentarily cycle system compressor
to move trapped refrigerant.
2. Check inlet hose for restrictions or
kinks. Remove Schrader valves and
core depressers from hoses (if
possible). Use larger hoses.
Circuit breaker trips 1. Low voltage at power source.
2. Extension cord too long, or too
small.
3. Excessive load on compressor /
motor.
1. Locate / use better outlet.
2. Reduce length of extension cord.
Increase size (gauge) of extension
cord (14 AWG minimum).
3. Reduce head pressure. Throttle inlet
valve to reduce load on compressor.
WARNING: TO PREVENT PERSONAL INJURY AND / OR EQUIPMENT DAMAGE,
ALLOW ONLY QUALIFIED PERSONNEL TO OPERATE AND REPAIR THIS UNIT. Before operating
or repairing the unit, read and follow the instructions and warnings in this manual. The technician must
be familiar with air conditioning and refrigeration systems, refrigerants, and the dangers of pressurized
components. If the technician cannot read this manual, operating instructions and safety precautions
must be read and discussed in the technician’s native language.