Sanden
Heat
Pump
–
Owner’s
Manual
Page
8
of
16
Trouble
shooting
guide
If you faced to a problem in a use of our heat pump water heater system, please check the
following things prior to calling for a support.
For those problems not listed in the list 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 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
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
No hot water
comes out of
water tap
Temperature
of hot water is
too low
Air absorption is not sufficient
due to a blockage on the
evaporator.
-Remove the object being blocking the air
flow through the evaporator
(e.g. fallen leaves, grass, snow, etc.)
