Trouble Shooting Guide - Sanden GAU-A45HPA Service Book

9. 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.
Status
Small or no hot water is left in
the storage tank.
Air removing procedure from the
heat pump system may be
insufficient.
No hot water
comes out of
water tap
Filter on cold inlet connector may
be blocked.
Temperature
of hot water is
Water flow speed may be
too low
dropped due to the heat pump
piping bend, blockage or crush.
Pipes may be frozen.
Stop valve is closed.
Air absorption is not sufficient
due to a blockage on the
evaporator.
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.
Considerable Causes
Sanden Heat Pump –– Service Technical Book
Page 36 of 48
Action to Take
- 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)
- Open the water drain plugs on the Heat
Pump Unit to remove air from water circuit.
(Be careful for burning)
- Check the filter and remove if there is any
blockage
- Check for any piping bend or crush and
remove if any
- If frozen area is found on the piping, melt
the ice on the pipe and provide a heat
insulation
- Open the valve
-Remove the object being blocking the air
flow through the evaporator
(e.g. fallen leaves, grass, snow, etc.)