Viessmann CM2B, Инструкции по обслуживанию для подрядчиков

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42
Fault code dis-
played System characteristics Cause Measures
F F4 Poor start-up characteristics,
rotary damper does not
close, solenoid valve does
not switch. Compensation lines not
connected, servomotor
faulty, servomotor power
cable faulty, solenoid
valve faulty, output relay
of burner control unit faul-
ty Check compensation lines and
connections (see page 66), re-
place connecting cables, replace
servomotor, replace solenoid
valve, replace burner control unit.
F F4 Flame does not build during
the safety time, no signal re-
ported by the ionisation flame
monitor. Incorrect gas type selec-
ted Adjust gas type (see page 11).
F F4 Flame does not build during
the safety time, no signal re-
ported by the ionisation flame
monitor. Gas train does not open. Check connecting cable; check
gas train and replace if required.
F F4 Flame does not build during
the safety time, no signal re-
ported by the ionisation flame
monitor. Combustion characteris-
tics not ideal Adjust burner setting. If necessary
also adjust the setting screws
when the burner is off to facilitate
the burner start.
F F5 Air pressure switch 1 reports
no air pressure, fan not run-
ning. Air pressure switch 1 faul-
ty, incorrectly connected
or incorrectly set Replace air pressure switch 1, con-
nect or adjust correctly.
F F5 Air pressure switch 1
switches off during operation Flue gas back pressure,
condensate banked up, air
pressure switch 1 hose
faulty, connecting hose
leaking Remove flue gas back pressure;
check if condensate banked up; re-
set burner control unit; replace
hose.
F F6 Gas pressure switch reports
no gas pressure. Gas shut-off valve closed;
gas pressure switch faulty;
multiple problems with gas
supply Open gas shut-off valve; check gas
flow pressure; replace gas filter if
required; reset burner control unit;
replace gas train.
F F7 Fan pressure is created dur-
ing the idle state check of air
pressure switch 1. Wind influence on fan Check the flue draught (stack).
F F7 Contact of air pressure switch
1 not in idle state Air pressure switch 1 faul-
ty Replace air pressure switch 1.
F F8 Flame tears off during opera-
tion. Incorrect gas type selec-
ted Adjust gas type (see page 11).
F F8 Flame tears off during opera-
tion. Burner gauze assembly
faulty Check the burner gauze assembly.
Replace the burner gauze assem-
bly if it is damaged.
F F8 Flame tears off during opera-
tion. Combustion characteris-
tics not ideal Adjust burner (see from page 16).
F F9 Fan not running; fan speed
not reached. Fan faulty; cables are faul-
ty or broken Check cables and replace the fan if
required.
F F9 Status duration too long, fan
ramp-up Internal fault; fan cannot
reach its set value. Replace fan or burner control unit.
F F9 Fan speed deviation Fan faulty, cable "
a-Ö
A"
faulty or broken
Check cable, replace cable "
a-Ö
A"
or fan if necessary.
Troubleshooting
Fault codes
(cont.)
5812086
Diagnosis