73
FAULT FINDING
Procedure
Note: Always check the operation of
the boiler for central heating first
before checking hot water operation.
Do not open a hot water tap unless
instructed to do so by the fault finding
guide (TURBOmax only).
1. If a fault code is showing in the
boiler display follow the fault
finding charts referring also to the
fault code and diagnostic mode
tables.
2. If the boiler is not functioning
correctly and a fault code is not
showing in the boiler display fol-
low the fault finding charts
referring also to the status mode
table.
3. Note: If the boiler display is
completely blank initially check the
two fuses (Isolate the electrical
supply before checking the fuses,
spare fuses are located on the
inside of the control box rear
cover).
To access the various modes press the
buttons on the control panel as
follows:
Please note: If no key is pressed for
approx. 4 minutes the display will
automatically change back to Normal
mode.
Logical fault finding
procedure
These checks must be carried out
before attempting to use the fault fin-
ding guide.
1. Carry out electrical safety checks
(See Section ‘Preliminary Electrical
Checks’).
2. Check that the external electricity
supply to the boiler is on, and a
supply of 230 V~ is present
between boiler terminals ‘L’ and
‘N’.
3. Check that the gas supply to the
boiler is on, that it has been
correctly purged and that an inlet
pressure of 20 mbar is available at
the gas valve. (See Section ‘Gas
Supply’).
4. Ensure the heating system is full of
water and charged to between 1
and 1.5 bar. If not, refill and vent
the system. (See Section ‘Filling the
heating system’).
Ensure boiler flow and return
service valves are open.
5. Check that the main ON/OFF con-
trol is set to the ‘ON’ position.
6. Set the central heating temperature
to maximum.
7. Set the domestic hot water
temperature to maximum
(TURBOmax only).
8. Check that all external controls are
on and calling for heat (if, no
external controls are fitted, boiler
terminals 3 and 4 must be linked).
Check that the boiler anti-cycling
economiser is not engaged.
Mode
To return
to Normal mode
Status mode
Press „i“ button Press „i“ button
Diagnostic mode
Press the „i“ and „+“
button simultaneously
Press the „i“ and „+“
button simultaneously
To display
the required mode
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