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Publication No. 5106226
38
6. Fault Finding Guide
Boiler Fault Finding
Fault Finding Guide
Status/Error Code Display
A 01
- Burner fails to light
- Lock out light 'ON'
- Reset & check
Is there negative pressure developed of at least
150 Pa (1.5 mbar) at the gas valve outlet pressure point.
Is there gas pressure during cycle?
Check differential pressure
as page 42.
Set
differential
Check
spark
Check
electrode
& reset
spark gap
spark
Check live to spark
generator
Change
control
box
Change
spark
unit
Check inlet
pressure to gas
valve - 20 mbar
Live
to fan?
Change
Boiler Control
Change
Boiler Control
Change fan
MAX0056A
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Check
gas
supply
Check gas valve
240v
(JP2 BL & BK)
YES
YES
Change
gas valve
YES
NO
Check
overheat
stat
NO
Replace
coil
NO
Check dial
gauge pressure
1 - 2.9 bar
Check sensor for damage/blockages
& electrical connections
etc replace as necessary
Recharge (replace)
vessel to 1 bar
NO
NO
NO
NO
YES
Check
condensate
trap is NOT
blocked
Remove
blockage
Check gas supply
continuity
ie. meter
governor etc
NO
NO
YES
Status/Error Code Display
A 15
- Reset & check
If burner lights for
3 seconds & goes out.
Check ionisation
probe & lead.
YES
YES
YES
Replace pressure relief valve
Is pressure relief
valve leaking?
Repressurise & check
system for leaks
Release pressure on system
check internal (primary)
expansion vessel is 1 bar