Flame monitoring fault, lockout
Condition
Possible cause
Action
Lockout during pre-purge.
Faulty flame detector
Change.
Faulty burner control
Check fault code. Replace.
Incorrect flame signal because of
extraneous light
Block extraneous light.
Flame forms. Lockout during
ignition phase or in normal
operation.
Incorrect flame detector position
Repair.
Dirty flame detector
Clean.
Flame too weak (light)
Check burner adjustments.
Faulty flame detector
Change.
Faulty burner control
Check fault code. Replace.
Lockout in shut-down period.
Faulty flame detector
Change.
Faulty burner control
Check fault code. Replace.
Incorrect flame signal because of
extraneous light
Block extraneous light.
Gas use:
Lockout during shutdown period
Flame does not extinguish: leaking
gas valves.
Replace.
Poor combustion
Condition
Possible cause
Action
CO content is too high or smoke
number too high.
Pressure drop in combustion head
too low.
Adjust pressure drop.
Diffuser disc burned out
Too low combustion air velocity:
incorrect adjustment ring position
Adjust, change diffuser disc if
necessary.
Too low partial load
Adjust, change diffuser disc if
necessary.
Incorrect distance between nozzle
and diffuser disc
Adjust.
6.10 Troubleshooting error codes
See the complete fault code list in the control unit manufacturer’s
manual.
Fault codes
Code
Description
1E
Servomotors do not reach pre-purge or ignition position. Faulty servomotor.
2F
Low gas pressure. Flame forms. Lockout and re-start occur.
1F, 2A, 29
Motor failure.
5
Faulty flame detector.
21
Safety loop open.
22
Temperature limiter released.
23
Lockout during pre-purge.
24
Lockout during shutdown.
25
Flame does not form.
M4248 2316EN
111 (114)
