Weishaupt W-FM 25 Manual page 62

Fault code Cause
A7h No flame signal after safety time
A8h Flame failure during operation
A9h Flame failure during stabilisation time (with pilot
ignition)
AAh Switch contact of air pressure switch not in
Standby
Air pressure switch does not react
Abh
Adh Insufficient gas low gas pressure switch
AEh Valve 1 leaking during valve proving
AFh Valve 2 leaking during valve proving
b6h Fault POC contact
bAh Flame simulation/extraneous light at start-up
bbh Burner shutdown via contact X3:7 (plug No. 7)
Valve proving faulty
CAh
Oil pressure switch does not switch
CCh
Cdh LDW 2 does not switch
83294002 • 2/2014-11 • La
Installation and operating instruction
Replacing combustion manager W-FM 20 ... 24 with W-FM 25
7 Troubleshooting
62-70
Rectification
▶
Check oil nozzles, replace if necessary
▶
Set ignition electrode(s)
▶
Check the ignition unit and replace if necessary
▶
Check solenoid valve and cable, replace if nec-
essary
▶
Check flame sensor or ionisation electrode and
cable, replace if necessary
▶
Check mixing pressure, if necessary reduce
▶
Check burner setting
▶
Replace combustion manager
▶
Check burner setting
▶
Check oil supply
▶
Check oil nozzles, replace if necessary
▶
Check flame sensor or ionisation electrode, re-
place if necessary
▶
see A7h
▶
Check air pressure switch and cable and replace
if necessary
▶
Replace combustion manager
▶
Check hoses on air pressure switch
▶
Check air pressure switch and cable and replace
if necessary
▶
Check burner motor and cable, if necessary re-
place
▶
Check gas connection pressure
▶
Set gas pressure switch
▶
Check gas pressure switch
▶
Check soundness of gas valve train
▶
Check setting and function of gas pressure
switch
▶
Replace double gas valve
▶
Check parameter E0 (see Ch. 4.2.4)
▶
Check soundness of gas valve train
▶
Check setting and function of gas pressure
switch
▶
Replace double gas valve
▶
Check POC contact
▶
Check double gas valve (valve 1)
▶
Find and eliminate extraneous light source
▶
Check flame sensor or ionisation electrode
–
▶
Check low gas pressure switch/valve proving
gas pressure switch
▶
Check double gas valve
▶
Check oil supply
▶
Check oil pump, if necessary replace
▶
Check oil pressure switch and cable, if neces-
sary replace
▶
Check pump motor and cable, if necessary re-
place
▶
Check hoses on air pressure switch
▶
Check air pressure switch and cable and replace
if necessary