Manual Heat Pump Model HHPM-V.2- SEP 2012
25
Status
Fault Code
Possible Caused
Remedy
Unit not
running
Comp Low Pressure
-Evaporator is blocked
-Clean evaporator
-Filter/Dryer is blocked
-Replace Filter/Dryer
-Loss of refrigerant
-Check leak, repair and charge -new
refrigerant
-TXV fail in closed position
-Clean and/or replace TXV
-Air filter is blocked
-Clean air filter
Comp Overload
-Phase rotation false
-Reconnect 2 power cable
-Compressor failed
-Replace compressor
Out Water / Tank
/Outdoor/ Inlet
-Sensor fault
-Reconnect cable sensor
-Replace sensor
Evap/Discharge
Temp Probe
Check Refrigerant
-Loss of refrigerant
-Refill refrigerant
-Set too high % min of control valve
-Faulty outlet hot water sensor.
-Set % min of control valve
-Replace outlet hot water sensor.
Unit is
running
but no
hot
water or
reduce
capacity
Low evaporating
pressure reading
-Duct is blocked
-Remove blockage
-Air filter is blocked
-Clean air filter
-Evaporator is blocked
-Clean evaporator
-Loss of refrigerant
-Check leak, repair and charge new
refrigerant
-Filter/Dryer is blocked
replace Filter/Dryer
High discharge pressure
reading
-Air trap in piping
-Vent air from the unit
-Water pump deteriorate
-Check pump performance replace
pump if necessary.
-Air/non condensable gas in -
refrigerant piping
-Removed refrigerant, evacuate and
charge new refrigerant
-Refrigerant overcharge
-Release refrigerant
-Condenser surface fouling
-Flush the unit, chemical clean if
necessary
-Pump and Fan run but
Compressor not running
-Compressor internal overload
-Allow the compressor to cooled
down and restart
