Weishaupt WTC-GB 90-A, Installation And Operating Instruction

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10.3 Rectifying faults
10.3.1 Warning codes
Warning code Cause Rectification
W12 Temperature at eSTB > 95 °C
Temperature at supply sensor > 95 °C
Temperature at return sensor > 95 °C
▶
Check the water flow.
▶
Check function of the pumps.
▶
Check parameter A32.
▶
Vent boiler on the water side.
W14 Temperature at eSTL increases too rapidly
▶
Check the water flow.
▶
Check function of the pumps.
▶
Check parameter A32.
▶
Vent boiler on the water side.
W15 Temperature differential between flow and return
to high
(The system goes to lockout after 30 warnings
with
F15
)
▶
Check function of pump, if necessary increase
pump rating.
▶
Check parameter A32.
▶
Safeguard system circulation.
W16 Flue gas temperature is too high (see parameter
33 )
▶
Check the heat exchanger (see Ch. 9.6).
W18
Difference eSTL and flow temperature too great
(The system goes to lockout after 30 warnings
with F18 )
▶
Check function of the pumps.
▶
Check parameter A32.
▶
Safeguard system circulation.
W21 No flame formation when the burner starts
(The system goes to lockout after 5 failed start
attempts with
F21
)
▶
Check the ignition unit and replace if neces-
sary.
▶
Check gas combi valve and cable and replace
if necessary.
▶
Check setting of gas combi valve.
▶
Clean or replace burner tube (see Ch. 9.5).
▶
Check phase of voltage supply.
W22 Flame failure during operation
(the system goes to lockout with
F21 after one
failed restart)
▶
Check the ionisation electrode and replace, if
necessary (see Ch. 9.4).
▶
Check O
2
settings.
▶
Clean or replace burner tube (see Ch. 9.5).
W24
Input H2 is closed, parameter
17
=
3
(lockout function)
▶
Check components connected to
input H2 (see Ch. 6.10).
W33 External sensor is defective
▶
Check the sensor and cable and replace if
necessary.
W34 DHW sensor defective
▶
Check the sensor and cable and replace if
necessary.
W39
De-couple sensor defective
▶
Check the sensor and cable and replace if
necessary.
W47 Gas pressure insufficient (< 13 mbar)
▶
Check gas connection pressure
(see Ch. 7.1.2).
W57
Communication WCM-CPU and WCM-CUI
faulty.
▶
Check the connection
▶
Rectify electromagnetic disturbance source.
W80 Communication to the cascade manager is faulty
▶
Check the connection
▶
Check the cascade manager.
▶
Check the address setting parameter 12 .
▶
Check the feed in from the eBus.
W81 Communication to WCM-FS is faulty
▶
Check the connection
▶
Replace the remote control station.
W82
Communication to EM#2 is faulty
▶
Check address.
▶
Check the connection
▶
Replace the extension module.
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
10 Troubleshooting
83266502 • 1/2010-08 • La
74-95