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13 Fault Finding
13.1 Fault Finding Flow Chart
STOP! Call the
helpline for
assistance
Is ATC in the
automatic
position?
Press 'M' on the ATC
until the sun symbol
is illuminated
Is heat pump
working?
No
Is the BTC showing
any demand or
WWSD?
Yes
Does ATC show
any fault code?
No
Is the circulating
pump running?
Yes
Is the fan
running?
Yes
Is the compressor
running?
Yes
The heat pump
appears to be
working correctly
36
BEGIN HERE
Is there
Not sure
power to the
heat pump?
Yes
Is there a demand from
the heating system?
Is heat pump in
defrost mode
Yes
Yes
Is there continuity
between terminal 1 &
No
2 and 1 & 3 at Heat
Pump control panel?
see note 1
Fault in system
wiring - see note 2
Yes
Normal Condition
See note 3
WWSD
No
Check 24Vac to pins
12 & 24 on BTC is
present?
Yes
Can this fault code
be repaired?
Does BTC show
any fault code?
No
Check pressure gauge
No
on side of heat pump
- see note 5
Has heat pump
tripped on high or
low pressure switch?
Yes
High pressure
switch?
Yes
Bleed air from
system - see note 7
No
Is the external
Yes
isolator turner on?
No
Turn on - Is
system working?
Yes
Yes
Problem solved!
Yes
Replace BTC
No
Yes
Trace fault on Heat
Pump See note 4
Yes
Can this fault code
be repaired?
Yes
Is the power at
the component?
No
Yes
Is there power to the
No
component leaving
the PCB?
No
No
Low pressure
switch?
Yes
Refrigerant low
- call helpline
Has MCB or
No
RCD tripped?
Yes
Reset MCB
or RCD
Does heat pump
run without
tripping?
Yes
No
Switch external
isolator 'OFF'
Reset MCB
or RCD
Does MCB
or RCD trip?
Yes
Seek help from
qualified electrician
Replace
component
Check capacitors
and replace if
necessary CAUTION
- see note 6
Replace PCB
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