HAMWORTHY HEATING LTD. PUREWELL PERMANENT IGNITION 500001090/B
27
Figure No. 15 – Fault-Finding Procedures
Initiate start procedure
No
Is Pilot Alight ?
Is Gas Cock Open ?
Open Gas Cock
No
Yes
Yes
Check Gas at Pilot ?
Purge Pilot Line, Check
for Blocked Orifice in
Pilot Burner. Check Gas
Valve Start Button is
Fully Depressed.
Check Piezo Spark Igniter
is Operating Correctly.
Check Electrode Gap.
It Should Be 3 - 4 mm.
Check Spark Lead is
Connected Correctly.
Check and Clean as
Required.
No
No
No
No
Check Spark Across
Electrode When
Operating Piezo ?
Are ECO Leads
Connected and Correctly
Fitted to the Temperature
Limiter ?
Yes
Repeat Pilot Lighting
Procedure
Does Pilot Remain ‘On’
When ‘Start’ Button is
Released ?
Yes
Yes
Is Temperature Limiter
Pin (on Controls Panel)
Reset ?
Reset Temperature
Limiter (Limit Stat).
No
Is Pilot Flame Sufficient
To Hold in Thermocouple ?
Yes
Adjust Pilot Pressure
until Flame Envelopes
Thermocouple Tip by
Approximately 12mm.
Replace Thermocouple
No
No
Check Thermocouple
Operation by Inserting a
mVolt (DC) Multi-Meter in
Parallel with ECO Lead.
Reading Should be at
least 8mVolts.
Yes
Continued
on next page