Symptoms
Fault
Action
Lockout near start of the green.
Unstable main flame.
Check the main gas air adjustment
for satisfactory flame.
Check position of and wiring to
flame sensing probe. Check also
that the probe is clean and dry.
Lockout at the end of the green section.
Insufficient air flow causing air pressure
Check the air pressure proving
This is the normal running position of the
switch to change to the normally open
system and investigate cause of
position of the control system.
position.
insufficient air flow.
Flame failure due to loss of gas supply.
Investigate the cause of gas supply
failure.
Flame failure due to an unstable flame.
Check the flame signal during the
switching from high to low to hire
fire. Adjust gas rates if necessary
and recommission the burner.
Flame failure due to weak flame sensing
Check position of and wiring to
signal.
flame sensing probe. Check also
that probe is clean and dry.
No main flame.
Check main SSOV’s are opening.
Note In the event that the fault cannot
be traced, it is recommended that the
services of a Nordair Niche Engineer
be obtained.
Nordair Niche (A Division of AmbiRad)
6-14 Bean Leach Road
Hazel Grove
STOCKPORT
Cheshire
SK7 4LD
Tel: 0161 482 7900
Fax: 0161 482 7901
Trouble shooting checklist