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TM077: 325 & 410 Series II Heat Pump Service Instructions
Rev 00: Issued April 2014
Fault Finding: Chart 11.10
Water Flow Troubleshooting
11.10
Use the proxy sensor or draw off water
to initiate a call for heating.
Is the circulator operating?
YES
NO
Clear the blockage or restriction in the
water system
– flexible hoses
(including kinks), circulator, heat
exchanger and tank fittings.
In poor water quality areas, descaling
may be required.
There is a blockage or restriction in
the water system.
NO
YES
Circulator operation can be
determined by feeling the body
of the circulator for vibration.
Is 240 volts present at the
circulator plug?
TEST 13
Is the circulator plug firmly and
correctly connected to the
controller?
Is the circulator motor winding
resistance correct?
TEST 14
Check the circulator impeller for
restriction or seizure.
Replace the circulator.
NO
NO
Connect the fan wiring or plug firmly
and correctly to the controller.
Ensure that the plug pins are clean
and making firm electrical contact. If
the pins are OK, replace the controller.
NO
YES
YES
YES
NO
Where installed, is the
cold water ball valve
on the storage tank open?
Open the ball valve.
YES
NO
YES
Where installed, is the hot water
check valve on the storage tank
installed in the correct direction?
Reinstall the check valve so the water
flow is directed towards the storage
tank.
NO
Is the circulator impeller
functioning?
Replace the circulator.
Is the circulator water flow
direction correct?
YES
Reinstall the circulator so the water
flow is directed towards the heat
exchanger.
NO
YES
Is there an air lock in the water
system?
Bleed the air out of the water system
from the hot water flexible hose union
at the storage tank.
