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Service
Troubleshooting
Fault diagnosis and repair
Before carrying out fault diagnosis,
check that the basic requirements for
correct operation are being fulfilled:
If a fault occurs on the burner, the red
light diode flashes on the display unit.
At the same time, the cause of the fault
is displayed and a fault code is
displayed.
Error/fault
Display without information
Display "Safety chain"
Motor does not start
Motor only runs briefly
Burner does not start
Crack formation on ionisation probe
· Is there any current?
· Is there any gas pressure?
· Is the gas stop valve open ?
· Are all control and safety devices,
such as the boiler thermostat,
low-water detector, limit switch, etc.
adjusted properly?
Cause
No mains voltage present
External cut-out defective
Display-control unit plug-and-socket
connection interrupted
Display defective
MPA 22 defective
No feedback on terminal 7
Control unit-motor plug-and-socket
connection interrupted
Capacitor defective
Motor defective
Control unit/servomotors feedback not
correct
Air pressure switch does not activate
Gas pressure switch does not activate
Gas filter dirty
Magnetic valve V1 does not open
No gas available
Compact valve defective
Ignition transformer defective
Ignition electrode position/Ignition cable
MPA 22 control unit defective
Ionisation probe/IRD probe
Too much gas on probe
Circulation insufficient
09/2005 - Art. Nr. 13 019 526A
Corrective action
Check
Check/replace
Check/establish connection
Replace
Replace
Insert bridge connector or given
Check switch/limiter
Establish connection
Check/replace
Check/replace
Control unit/servomotors
Check/replace
Check/change adjustment
Check/change adjustment
Clean/replace gas filter
Check/replace compact valve
Notify gas supplier
Note: in the event of a gas shortage,
the waiting time can be reset by
de-energising the burner (7-pin plug)
Replace
Replace
Check/replace
Check/replace
Check/replace
Fit solid screws (propane gas set)
EN
31
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