Possible Malfunctions And Their Causes - S+H Nolting NG-LF 10 S Mode D'utilisation

8. POSSIBLE MALFUNCTIONS AND THEIR CAUSES :

Malfunction:
WAH does not start
WAH starts, there is ignition
but the solenoid valve does
not open.......fault shutdown.
WAH starts ; no ignition
Solenoid valve opens,
gas flows in........fault shutdown.
WAH starts, there is ignition,
solenoid valve opens, gas flows
in and 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.
Cause:
There is no room thermostat
connected or bridge
missing
Room thermostat incorrectly set
Electrical power supply
Gas supply
Relay defect (Item 18)
Safety thermostat triggered or is
defective (Item 8 )
Automatic gas firing unit
defective (Item 9 )
Infrared flicker detector defective
(Item 2) or exposed to outside
light
Infrared flicker detector gives a
flame signal during the lead-in
time (red LED), although no
flame has been established.
Ignition electrode defective
(Item 12)
Ignition gap too large
Ignition cable defective (Item 13)
Automatic gas firing unit
defective
Infrared flicker detector dirty or
defective
Magnet mounting defective
(Item 7)
Gas regulator defective (Item 16)
Gas pressure
Nozzle dirty
Solenoid or gas line clogged
(Item 21)
Infrared flicker detector
Ignition
Switch box
Gas pressure
- 15 -
Remedy:
Connect room thermostat
or establish bridge on the
terminal bar
Check setting
Check the power plug and the
power supply
Check
Replace
Reset or replace
Replace
Replace or prevent
impingement of external light
Replace
Reduce
Replace
Replace
Clean or replace
Replace
Replace
Check
Clean, replace
Clean by blow-through
Check
Check
Check for loose contacts
Check