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SECTION 4 - FAULT FINDING
4 FAULT FINDING
4.1 OPERATION MODES
DISPLAY CODE ON BOILER
DESCRIPTION
The boiler is in standby operation awaiting either a central heating call or hot water demand.
The boiler has a call for central heating but the appliance has reached the desired
temperature set on the boiler.
The boiler has a call for hot water but the appliance has reached the desired temperature set on
the boiler.
The boiler is operating in central heating mode.
The boiler is operating in domestic hot water mode.
The boiler is operating in frost protection. Note that after the boiler has reached temperature it
will show “dH” for 60s whilst it also protects the DHW circuit.
The boiler mode knob (C) is in the off position, rotate fully clockwise for hot water and central
heating operation.
00
80
80
60
60
1 0
CH
CH
H
FP
--
H
†
†
†
†
†
† = temperature shown for example purposes only.
