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5P1, 5P2, 5P3, 5P6, 501 & 504 Fault codes.
The fault code explanations for all the above fault codes are below, with the fault-finding guidance directly after
and on the next page.
5P1 Description: 1st ignition attempt error
Cause: No flame detection on the 1st ignition attempt. No ionisation >0.8 μA detected on first start attempt. 2
nd
launch is successful. Check ionisation current on ignition via customer information menu or parameter 8.7.5.
5P2 Description: 2nd ignition attempt error
Cause: No flame detection on 2nd ignition attempt. No ionisation > 1μ detected during the first 2 start attempts. The
boiler ignited during the 3rd, 4
th
or 5
th
start attempt. Check ionisation current on ignition via parameter 8.7.5.
5P3 Description: Flame lift
Cause: Flame loss when the boiler is in operation; boiler ignited correctly, and the ionisation current is cut off after
the safety time. Check ionisation current during operation is >0.5μA via customer information menu or parameter
8.7.5.
5P6 Description: No flame
Cause: Boiler has failed to ignite after 5 attempts.
501 Description: No Flame Detected
Cause: No flame or ionisation current > 0.5μA during 5 consecutive start attempts of the same heat demand.
504 Description: Flame lift from burner.
Cause: Flame goes out during burning, burner ignited successfully but ionisation drops out after safety time.
1. Check condensate pipe is clear of blockages and is running freely. Clear as required.
2. Check 240v at gas valve, connections 1 & 3.
a. If the voltage is correct, move to step 3.
b. If there is no voltage at the gas valve, check the PCB is sending 240v to the gas valve from connector
CN2, pins 1 & 2. Replace PCB if there is no voltage.
c. If voltage is supplied from the PCB, check the condition of the wiring harness and connectors. Use a
multimeter to confirm continuity throughout the cables. Replace harness if faulty.
3. Check the working pressure at the P1 test point of the gas valve with all gas appliances in the house fully on.
The WP must be no less than 4mb under that of the WP at the gas meter for NG or 2.5mb for LPG.
a. If WP at the meter is under 19mb call National grid or local network to investigate the issue.
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