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7 Troubleshooting
7.1 Procedures for fault conditions
CAUTION
Damage resulting from incorrect servicing
The combustion plant could be damaged.
▶
Do not carry out more than 2 lockout resets successively.
▶
Faults must be rectified by qualified personnel.
7.1.1 Display off
If the burner does not start despite heat demand:
▶
Check voltage supply
▶
Check unit fuse F7 (see Ch. 3.1).
▶
On burner size W30 and W40, the contactor can be fitted to a separate voltage
supply from the burner motor if required (contactor available as accessory).
▶
Check function and setting of all regulating, control and safety devices.
▶
Check all burner related functions.
7.1.2 Display flashes
A burner fault has occurred. The burner is in lockout. The error code is displayed
flashing.
Fault codes
▶
Read error code, e. g.
A7h
.
▶
If required, additional information can be displayed by pressing the key
▶
Rectify cause of fault (see Ch. 7.2).
Resetting
▶
Press [ENTER] key.
✓
Burner has been reset.
Fault memory
The last 9 faults are saved in the fault memory (see Ch. 4.2.2).
Installation and operating instruction
Replacing combustion manager W-FM 20 … 24 with W-FM 25
7 Troubleshooting
83294002 • 2/2014-11 • La
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Summary of Contents for W-FM 25
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