Troubleshooting
101
Diagnosis (continued)
Faults with fault display on the programming unit (continued)
code in
display
Behaviour of system
Cause of fault Action
30
Burner is switched on and off by
the adjustable high limit
Short circuit
Boiler temperature sensor
Check boiler temperature sensor (see
page 42)
38
Burner is switched on and off by
the adjustable high limit
Open circuit
Boiler temperature sensor
Check boiler temperature sensor (see
page 42)
50
DHW pump ON:
set-point boiler temperature =
set-point DHW tank temperature,
priority controls are cancelled
or
In conjunction with DHW heating:
Tank heating is switched on and off
by Tank temperature sensor 2
Short circuit
DHW tank temperature sensor 1
Check DHW tank temperature sensor
(see page 43)
51
In conjunction with DHW heating:
Tank heating is switched on and off
by Tank temperature sensor 1
Short circuit
DHW tank temperature sensor 2
Check DHW tank temperature sensor
(see page 43)
58
DHW pump ON:
set-point boiler temperature =
set-point DHW tank temperature,
priority controls are cancelled
or
In conjunction with DHW heating:
Tank heating is switched on and off
by Tank temperature sensor 2
Open circuit
DHW tank temperature sensor 1
Check DHW tank temperature sensor
(see page 43)
59
In conjunction with DHW heating:
Tank heating is switched on and off
by DHW tank temperature sensor 1
Open circuit
DHW tank temperature sensor 2
Check DHW tank temperature sensor
(see page 43)
60
No output reduction
Return control open
Boiler with maximum temperature
Short circuit
Temperature sensor aJA
Check temperature sensor
(see page 44)
68
No output reduction
Return control open
Boiler with maximum temperature
Open circuit
Temperature sensor aJA
Check temperature sensor
(see page 44)
Shunt pump ON continuously
Short circuit
Check temperature sensor
In conjunction with DHW heating:
Mixing valve of primary circuit
closed, no domestic hot water
heating
Temperature sensor aJB
(see page 44)
Shunt pump ON continuously
Open circuit
Check temperature sensor
In conjunction with DHW heating:
Mixing valve of primary circuit
closed, no domestic hot water
heating
Temperature sensor aJB
(see page 44)
5351 338 v1.6
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