3.2 Malfunction messages
A malfunction message is indicated by a flashing number or letter on the diagnostic display combined with a locked
control unit. Once the malfunction is solved, the control unit must be unlocked by pressing the reset button once.
Should the control unit fail to unlock, try again after approx. 20 seconds.
The possible causes are described below in order of probability. Also look for the malfunction in this order.
Code Diagnosis
Cause
Diagnostic
display
2
Fan defective (5 hz deviation per
minute)
•
Fan not turning
•
Fan’s electrical connection loose or improperly connected
•
Control unit
3
Incorrect ionisation (flame) signal
•
Valve in gas valve remains open or leaks
•
Control unit
3.
No ionisation (flame) signal during
start-up procedure
•
No gas supply
−
gas tap closed
−
gas valve defective
−
gas valve’s electrical connection loose or improperly connected
•
Air supply obstructed
•
Flue tube obstructed
•
Siphon obstructed
•
Ionisation cabling not in order
•
Ionisation probe defective or causing short-circuit such as against burner
•
No ignition
−
ignition transformer electrical connection loose or improperly
connected
−
power cable defective
−
ignition electrode defective or causing short-circuit
•
Control unit
4
Ionisation signal lost during heat
supply (diagnostic code 1 - 4)
•
Insufficient gas supply
•
Siphon obstructed
•
Ionisation electrode defective / causing short-circuit such as against
burner
•
Gas valve set incorrectly
•
O
2
content more than 7.5% at low setting
•
Fan’s low capacity circuit defective or interrupted
•
Burner damaged
•
Control unit
4.
Ionisation signal remains too long
after heat supply
•
Valve in gas valve defective, remains open or leaks
•
Control unit
6
Gas valve control receiving voltage
erroneously
•
Wiring error
•
Control unit
ATMOS MULTI Mk2 version 2004
Appendix Page 14
Summary of Contents for Multi Mk2
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