Installation and operating instruction
Gas condensing unit WTC-GB 15-B Compact and WTC-GB 25-B Compact
10 Troubleshooting
83309302 1/2018-05 La
141-196
10.4 Operating problems
Condensing boiler
The following faults must only be rectified by qualified personnel:
Observation
Cause
Rectification
Burner is humming/whistling
burner surface soiled / damaged, fleece
loose
Check burner surface, if necessary
clean or replace [ch. 9.1.3].
Intake sound attenuator faulty
Check connection between intake
sound attenuator and fan.
Check intake sound attenuator, re-
place if necessary.
Poor start behaviour
Ignition electrode distance incorrect, ig-
nition electrode damaged
Replace ignition electrode [ch. 9.1.4].
Ignition occurs too late
Time until flame formation too long, in-
crease parameter
2.3.1 Correc-
tion gas quantity at start
step by step, whilst observing CO
content [ch. 6.6.2.3].
Smell of flue gas
Siphon fill level insufficient
Fill siphon [ch. 9.1.5]
Pump capacity insufficient
Circulation pump set to incorrect operat-
ing mode
Check operating mode of pump.
No flame formation following
gas combi valve replacement
Value of parameter
Gas valve off-
set storage
incorrect
Change parameter
2.3.6 Gas
valve offset storage
,see