Sanden
Heat
Pump
–
Installation
Manual
Page
18
of
26
Notes:
1. After a component is replaced or the inspection is completed, turn the unit on/off
several times to confirm the error does not re occur.
2. If the corrective actions above do not solve the error problem, a malfunction of the
PCB is highly likely.
Thermistor detection error
- Reconnect the expansion valve
connector, check if it is off the PCB
- Replace the expansion valve (together
with PCB), or the entire unit of heat
pump
E045 HP
defrost
thermistor detection error
- Check if the thermistor is mounted in
position on the evaporator
- Replace the defrost thermistor
E047
High pressure side error
- Check the heat pump piping filter for
any blockage
- Check if any piping bend, blocking or
crush
- Inspect if the pipes are being frozen
- Open the valve on water mains
- Open the stop valves
- If the water circulation pump is not
moving, replace the pump
E048
High ambient temperature defrost
drive error
- Remove foreign objects from the
evaporator (e.g. fallen leaves, grass,
snow)
- Replace the ambient temperature
thermistor
- Replace the defrost thermistor
E070
Fan motor locked
- Reconnect the connector, check if it is
off the PCB
- Replace the fan motor
E071 Fan
motor
revolution
error
E073
Water circulation pump locked
- Check for heat pump piping block and
crush
- Confirm that the connector on the
water circulation pump cable sitting on
the PCB properly
- Replace the water circulation pump
E090
～
E150
System control error
Replace the PCB
