Rectifying Faults; Warning Codes - Weishaupt WTC-GB 90-A Installation And Operating Instruction

Warning code Cause
Temperature at eSTB > 95 °C
W12
Temperature at supply sensor > 95 °C
Temperature at return sensor > 95 °C
W14 Temperature at eSTL increases too rapidly
W15 Temperature differential between flow and return
to high
(The system goes to lockout after 30 warnings
with F15 )
W16 Flue gas temperature is too high (see parameter
33 )
W18 Difference eSTL and flow temperature too great
(The system goes to lockout after 30 warnings
with F18 )
W21 No flame formation when the burner starts
(The system goes to lockout after 5 failed start
attempts with F21 )
W22 Flame failure during operation
(the system goes to lockout with F21 after one
failed restart)
W24 Input H2 is closed, parameter 17 = 3
(lockout function)
W33 External sensor is defective
W34 DHW sensor defective
De-couple sensor defective
W39
W47 Gas pressure insufficient (< 13 mbar)
Communication WCM-CPU and WCM-CUI
W57
faulty.
W80 Communication to the cascade manager is faulty
W81 Communication to WCM-FS is faulty
W82 Communication to EM#2 is faulty
83266502 • 1/2010-08 • La
Installation and operating instruction
Gas condensing boiler WTC-GB 90-A
10 Troubleshooting

10.3 Rectifying faults

10.3.1 Warning codes

74-95
Rectification
▶
Check the water flow.
▶
Check function of the pumps.
▶
Check parameter A32.
▶
Vent boiler on the water side.
▶
Check the water flow.
▶
Check function of the pumps.
▶
Check parameter A32.
▶
Vent boiler on the water side.
▶
Check function of pump, if necessary increase
pump rating.
▶
Check parameter A32.
▶
Safeguard system circulation.
▶
Check the heat exchanger (see Ch. 9.6).
▶
Check function of the pumps.
▶
Check parameter A32.
▶
Safeguard system circulation.
▶
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.
▶
Check the ionisation electrode and replace, if
necessary (see Ch. 9.4).
▶
Check O settings.
2
▶
Clean or replace burner tube (see Ch. 9.5).
▶
Check components connected to
input H2 (see Ch. 6.10).
▶
Check the sensor and cable and replace if
necessary.
▶
Check the sensor and cable and replace if
necessary.
▶
Check the sensor and cable and replace if
necessary.
▶
Check gas connection pressure
(see Ch. 7.1.2).
▶
Check the connection
▶
Rectify electromagnetic disturbance source.
▶
Check the connection
▶
Check the cascade manager.
▶
Check the address setting parameter 12 .
▶
Check the feed in from the eBus.
▶
Check the connection
▶
Replace the remote control station.
▶
Check address.
▶
Check the connection
▶
Replace the extension module.