Possible Malfunctions And Their - S+H Nolting NG-15 Mode D'utilisation

8. POSSIBLE MALFUNCTIONS AND THEIR CAUSES :
Malfunction:
WAH does not start
WAH starts, ignition present
but solenoid valve does not
open ... ... ... ... . f ault shutdown.
WAH starts, no ignition,
solenoid valve opens,
gas flows in....fault shutdown.
WAH starts, ignition present,
solenoid valve opens, gas
flows in, is ignited ............
after several seconds fault
shutdown occurs.
WAH starts, ignition present,
solenoid valve opens, no gas
flows in.........fault shutdown.
WAH occasionally goes to fault.
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Cause:
No room thermostat connected or
no bridge on the thermostat jack
(Item 20)
Room thermostat incorrectly set
Gas hookup
Safety thermostat triggered or is
defective (Item 15)
Automatic gas firing unit
defective (Item 16 )
Ignition electrode defective
(Item 12)
Ignition gap too large
Ignition cable defective (Item 7)
Automatic gas firing unit
defective (Item 16 )
Automatic gas firing unit
defective (Item 16 )
Ionization cable dirty or defective
(Item 23)
Ionization electrode dirty or
defective (Item 17)
Gas regulator defective (Item 14)
Gas pressure
Nozzle clogged
Solenoid or gas line clogged
(Item 9)
Ionization ignition electrode
(Item 17 )
Ignition
Switch box
Gas pressure
- 16 -
Remedy:
Connect the room thermostat
or bridge to the thermostat
jack
Check setting
Check
Reset or replace
Replace
Replace
Reduce
Replace
Replace
Replace
Clean or replace
Clean or replace
Replace
Check
Clean, replace
Clean by blow-through
Check
Check
Check for loose contacts
Check