Glow-worm Energysaver Combi 80-100 - Manual (Page 30)

30 221564F
13 Fault Finding
13.1 Digital Display - Fault Codes
If a fault has occurred during operation of the boiler the display
will start flashing.
Two numbers will alternate to show what type of fault has
occurred.
The second number has a decimal point after it.
Fault Code =
0
and
0
.
There is a flame signal without there being a flame present.
Press the reset button.
If the fault recurs, check the ignition electrode and wire.
Check to see if there is 24V a.c. on the gas valve.
If there is 24V a.c. at the gas valve then replace the Automatic
control module, see section 14.4.
After replacing the Automatic Control Module, press the “reset”
button and check that the boiler functions correctly. Check that
flames extinguish correctly and that after heating demand is
complete there is not 24V a.c. present at the gas valve.
Fault Code =
0
and
2
.
There is no flame ionisation.
This fault code may appear on commissioning the boiler and
may simply due to the presence of air in the gas line.
Press the reset button and the ignition phase will be repeated.
If the problem recurs, then proceed as follows:
Check that the gas supply to the boiler is turned on.
Check that during the ignition phase there are sparks present at
the electrode.
Check that the spark gap of the electrode is correct, see section
12.4.
Check that the resistance of the ignition wire is less than 1000
ohms. If the resistance is too high, change the lead. See section
14.3.
Re-check to see if sparks are present at the electrode. If not
check the electrode and change if necessary, see section 14.2.
If there is still no spark at the electrode then the Automatic
Control Module needs replacing, see section 14.4.
If the burner lights but the flame is not detected, the CO
2
level
may be too low to sustain combustion. Refer to section 12.6. Try
turning the adjustment screw clockwise to increase the CO
2
content. If the burner flame is still not detected, then the
Automatic Control Module needs replacing. Refer to section
14.4.
If the gas valve setting has been adjusted in any way, the CO
2
value must be reset to the correct value. See section 12.6.
Fault Codes =
0
and
3
.,
0
and
5
.,
0
and
6
.,
0
and
7
.,
1
and
1
.,
1
and
3
.,
1
and
4
.,
1
and
5
.,
1
and
6
.,
1
and
7
.,
4
and
1
.,
4
and
2
. and
6
and
0
.
There is an internal fault in the Automatic Control Module.
Try pressing the “reset” button.
If the fault is not cleared, the Automatic Control Module should
be replaced. Refer to section 14.4.
Fault Codes =
0
and
4
.
Power supply has been interrupted.
This fault code may appear on first commissioning the boiler, or
if the power is interrupted while the boiler is in operation.
Press the “reset” button.
If the fault code is not removed then an internal fault has
occurred in the Automatic Control Module.
Refer to section 14.4 and replace the module.
Fault Code =
2
and
4
.
The heating flow thermistor and heating return thermistor are
connected the wrong way round.
Exchange the thermistor positions or their wiring.
Fault Code =
3
and
0
.
There is excessive temperature difference between the flow
and return thermistors.
Check that the pump is functioning correctly.
Check that the system is not air locked.
Check that the flow rate through the installation is high enough.
Refer to section 4.3.
Fault Code =
3
and
1
.
The heating flow thermistor is short circuited.
Check the wiring between the thermistor and the Automatic
Control Module for a short circuit.
If the wiring is sound, change the thermistor. Refer to
section 14.8.
Fault Code =
3
and
2
.
The heating return thermistor is short circuited.
Check the wiring between the thermistor and the Automatic
Control Module for a short circuit.
If the wiring is sound, change the thermistor. Refer to
section 14.9.
Fault Code =
3
and
6
.
The heating flow thermistor is too resistant.
Check that the wiring has not become disconnected
If the wiring is sound, change the thermistor. Refer to
section 14.8.
Fault Code =
3
and
7
.
The heating return thermistor is too resistant.
Check that the wiring has not become disconnected.
If the wiring is sound, change the thermistor. Refer to
section 14.9.
Fault Code =
0
and
8
.
The Air pressure switch has not closed.
Check that the air pressure switch is functioning correctly.
Switch off the electrical supply to the boiler.
Remove the sensing pipe from the fan elbow and gently suck on
the pipe. The air pressure switch should click shut. Immediately
crimp the sensing pipe and note whether the air pressure switch
holds pressure. A new air pressure switch is required if under
these conditions the switch drops to open circuit within a few
seconds of crimping the pipe. See section 14.22 for replacement.
Reconnect the sensing pipe to the fan elbow and switch on the
electric mains supply. If the boiler does not fire check the
following.
Check that the condense drain is not blocked and backing up
into the heat exchanger. See section 12.5 for instructions on
cleaning.
Check for any obstruction to the flue system internally.
Check the fan and burner cleanliness as in section 12.3.