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3062547_201802
39 Troubleshooting
40
Insufficient water
pressure
The pressure switch does not switch on,
water pressure is too low (< 0.8 bar)
Check system pressure >1.5 bar
Check water pressure switch,
check lead,
press reset
42
Condensate pump not
pumping
Condensate pump is defective
Drain line is blocked
Power supply pump is missing
Check pump,
check drain line,
check mains plug and fuse
52
Max. Cylinder heating
time exceeded
Set cylinder temperature has not been reached,
sufficient flow
Vent cylinder,
increase cylinder heating time (HG20),
check cylinder sensor installation
78
Header sensor fault
Faulty header sensor or lead
Check sensor and lead
Insufficient heating
system heating,
frequent cycling
Air in the heating or cylinder system
Vent radiators,
vent cylinder primary circuit,
vent heating circuit pumps,
vent boiler
No DHW heating
Sensor is not detected by the boiler
Switch boiler off and on;
sensor will be detected on restarting
Fault
code
Fault
Cause
Remedy
Summary of Contents for COB
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