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T
ROUBLESHOOTING
Troubleshooting and Diagnosis
MALFUNCTION
If the appliance
is not cooling...
If the appliance
is not heating...
If the air ow is insu cient,
or no longer circulates
inside the vehicle...
If there is water seeping
into the vehicle...
If the machine
does not start...
If the machine
stops working...
Special Supplemental Maintenance:
For optimal e ciency, it is recommended to have
your dealer/contractor perform designated cleaning
prior to using, on the heat exchange coils and the
condensation drain holes.
22
, M
AINTENANCE
POSSIBLE CAUSES
e current temperature is lower than 64°F
e set point temperature has been satis ed
Defective thermistor or thermal protection
Low refrigerant
e compressor is damaged
e heat exchanger coils are dirty
e external fan is defective
e MODE button is not in the right position
e current temperature is higher than 86°F
e set point temperature has been satis ed
Defective thermistor or thermal protection
Low refrigerant
e compressor is damaged
e heat exchanger coils are dirty
Damaged/Stuck 4-Way Valve
e MODE button is not in the right position
e heat exchanger coils are dirty
e internal/interior fan is malfunctioning
e air lter is dirty/obstructed
e condensate drain hose is cracked, clogged,
or is not secured onto the exhaust port
Defective thermal protection
Damaged Compressor
ere is insu cient power going into the unit
e voltage is too low (less than 100V)
e electric condenser is damaged/malfunctioning
Defective thermistor or thermal protection
e heat exchanger coils are dirty
e air lter is dirty/obstructed
e external fan is defective
e voltage is too low (less than 100V)
e electric condenser is damaged/malfunctioning
support@pdhvac.com | (800)-675-7410 | https://www.pdhvac.com/support/
, R
ECYCLING
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