– 17 –
Symptom
Cause
Remedy
5. Replace with factory required
type of gas.
6a. UV Sensor - clean lens, check
wiring and spark plug.
6b. Flame Rod - assure rod is in
flame, check wiring and flame
rod.
7. Check wiring or replace
transformer if correct.
1. Place in run position (see
technical cut sheet on flame
safeguard relay).
1. Turn Heat-Off-On switch to Off
position. Slowly open all manual
gas shut-off valves before
restarting.
2. Clear obstruction in vent orifice/
line or replace if defective.
3. Turn Heat-Off-On switch to Off
postion. After 7 seconds of
prepurge, pilot will light. Then
after 6 to 10 seconds main valve
light will come on. Check to see
if all gas valves have opened. If
not, check voltage at gas valve.
If voltage is found to be correct,
replace gas valve or actuator
(see Maxitrol troubleshooting
Guide for modulating valve).
4a. Check burner for low fire
adjustment.
4b. UV Sensor - clean lens and
check wiring.
4c. Flame Rod - be sure flame rod is
in main flame, check wiring and
flame rod.
1. Place in Run position (see
technical cut sheet on flame
safeguard relay).
5. Type of gas (natural - LP)
supplied different from factory
required type. Note: components
may change.
6. Flame detection system not
sensing pilot flame.(see spark
rod diagram #P-001003)
7. No voltage on secondary side of
ignition transformer.
1. Flame safeguard relay Run/Test
switch in Test position or
functioning problem.
1. Manual gas shut-off valve closed.
2. No gas on outlet side of
regualtors with inlet pressure ok.
3. No gas on outlet side of valve or
actuator with inlet pressure ok.
4. Main flame rod or scanner not
sensing main burner.
1. Flame safeguard relay Run/Test
switch in Test position or
fucntioning problem.
SECTION VII - TROUBLESHOOTING
continued
D.
continued
E. If pilot does not light after
prepurge has timed out
and there is no voltage at
flame safeguard relay
output terminals.
F. If there is no heat with
pilot ok and voltage is
present at flame
safeguard relay output
terminals.
G. If there is no heat with
pilot ok and no voltage is
present at flame
safeguard relay output
terminals.
System with Pilot
continued