Sanden
Heat
Pump
–
Owner’s
Manual
Page
8
of
20
Trouble shooting guide
If you face a problem while using our Heat Pump water heater system, please check the
following table prior to calling for support.
For those problems not listed above, an inspection provided by a skilled engineer is
required. Please contact the distributor.
Caution:
Do not shut the electricity supplied to the Heat Pump system off even if you go away from
home and do not use hot water for a long while.
If the system is equipped with freeze protect heaters, also do not shut the power supply to
the heaters.
Failure to do so may cause a crack on the pipes due to the pipes getting frozen.
Status
Considerable Causes
Action to Take
No hot water
comes out of
water tap
Temperature
of hot water is
too low
Small or no hot water is left in
the storage tank.
- Stop using hot water and wait for about 1
hour
- Consider a change of the electricity
supply off-peak mode (Length of power-
supply hours may be too short for the
water heating cycle to cover the hot water
consumption)
Air removing procedure from the
heat pump system may be
insufficient.
- Open the water drain plugs on the Heat
Pump Unit to remove air from water circuit.
(Be careful for burning)
Filter on cold inlet connector may
be blocked.
- Check the filter and remove if there is any
blockage
Water flow speed may be
dropped due to the heat pump
piping bend, blockage or crush.
- Check for any piping bend or crush and
remove if any
Pipes may be frozen.
- If frozen area is found on the piping, melt
the ice on the pipe and provide a heat
insulation
Stop valve is closed.
- Open the valve
Air absorption is not sufficient
due to a blockage on the
evaporator.
-Remove the object blocking the air flow
through the evaporator
(e.g. fallen leaves, grass, snow, etc.)
