Installation manual

Sanden Heat Pump – Installation Manual
Page 23 of 32
Notes:
1. After a component is replaced or the inspection is completed, turn the unit on/off several
times for a minimum of 60 seconds at a time 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
most likely.
E042
HP outlet temperature thermistor
detection error
- Check if the thermistor is out of the
mounting pocket on the water outlet pipe
E043
HP discharge over temperature 1
- Replace the discharge temp thermistor
- Reconnect the expansion valve PCB
connector, check to ensure connection
- Replace the expansion valve (together
with PCB), or the entire heat pump unit
E044
HP discharge temperature
Thermistor detection error
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 for any piping bend, blocking or
kink
- Check if the pipes are frozen
- Ensure mains water supply is available
- Ensure all shut off valves are open
- If the water circulation pump is not
working, replace the pump
E048
High ambient temperature defrost
drive error
- Remove foreign objects from the
evaporator coil (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 the heat pump piping for
blockage or kinking
- Confirm that the connector for the
water circulation pump is connected to
the PCB correctly
- Replace the water circulation pump
E090
～
E150
System control error
Replace the PCB