71
FLAME LOSS
Check the Detection Electrode and associated Harness
for continuity, visual condition and position (refer to
Frame 46). Check if the Condensate Pipe is blocked.
Check if the Flue is blocked. Replace as necessary
yes
If the boiler is Reset, does the boiler Ignite
for a short time and then Extinguish
no
Check Gas Supply and rectify fault
no
Is the Gas Pressure available at the boiler > 18mbar?
yes
Is 230Vac available at the Gas Valve?
Check wiring from Gas Valve to PCB
and replace if necessary, otherwise
replace the main PCB
no
yes
Check Spark Generator and associated Harness for
continuity, visual condition and position (refer to Frame
46). Are these functioning correctly?
Replace Spark Generator and
Harness as necessary
no
yes
Check Ignition Electrode and associated Harness for
continuity, visual condition and position (refer to Frame
46). Are these functioning correctly?
Replace Ignition Electrode and
associated Harness as necessary
no
yes
Replace Gas Valve
Replace Gas Valve
no
72
LOW WATER PRESSURE OR CONDENSATE BLOCKAGE
yes
Disconnect the wires to the Water Pressure Switch.
Are the Water Pressure Switch contacts made?
no
Fill and vent the system and open all
Isolation Valves
no
Are the boiler and CH system lled with water and all
Isolation and Radiator Valves open?
yes
Does the wiring from the Water Pressure Switch to the
PCB have continuity and is it securely connected?
Ensure wiring has continuity and is
securely connected
no
yes
Replace Water Pressure Switch
yes
Disconnect the wires to the Condensate Blockage Pressure
Switch. Are the Pressure Switch contacts made?
Replace the wiring from the Module
PCB to the Water Pressure Switch
and the Condensate Blockage
Pressure Switch
yes
no
Check Syphon and condensate drain pipework for
blockage and rectify if necessary. Boiler now working OK?
no
Replace Condensate Blockage Pressure Switch
51
- Installation & Servicing
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