Model 201GAS burner — Instruction manual
Carlin part number MN201GAS Rev. 03/14/11
– 18 –
Where appliance instructions differ from this manual, follow the appliance instructions.
7. Troubleshooting
(continued)
Problem
Possible
cause
Corrective action
WARNING
These procedures must only be performed by a qualified service techni-
cian. Use care when performing tests on electrically or mechanically live
parts. Disconnect power to burner/appliance and close main manual gas
valve when removing components for service. Failure to comply could
result in severe personal injury, death or substantial property damage.
Burner lights, but
locks out after TFI
Insufficient flame
signal
Flame signal at test jack on 60200FR must be at least 0.8 microamps.
Check following if signal is lower. Flame rod may be touching ground,
insulator may be broken, or contamination may cause path to ground.
Inspect and clean if necessary. See Figures 5 and 6, page 8 for more infor-
mation. Check flame rod position in burner per Figures 5 and 6, page 8.
Adjust if necessary. Flame rod must be correctly positioned for best flame
signal.
Ignition — no
spark or poor
spark
Check wire connections to ignitor electrode.
Check position of ignitor electrode per Figures 5 and 6, page 8. Adjust if
needed.
Check primary voltage to ignitor. If ignitor receives 120 VAC and doesn't
generate spark, replace ignitor.
Airflow
Check air band setting against Table 1, page 7.
Wrong orifice size Verify orifice size per Table 1, page 8. See pages 7 and 8 for procedure.
Manifold pressure Check combination gas valve outlet pressure — should be between 3.2
and 3.8 inches w.c.
Inadequate gas
supply
Check line pressure at combination gas valve supply pressure tapping.
Gas pressure must be at least 5 inches w.c. If other appliances are on
same line or regulator and burner pressure drops when they are on, line
is undersized. Contact your gas supplier. If gas pressure is always low,
check supply regulator setting and adjust if necessary. Gas pressure must
not exceed 14 inches w.c.
Improper draft
Over-fire draft should not be higher than specified in the appliance manu-
facturer’s instructions. Follow the appliance manual instructions to trou-
bleshoot excess overfire pressure or poor draft problems if necessary.
Flame rod
grounded
Check flame rod and insulator. If flame rod is grounded in any way, the
control will lockout after the trial for ignition.
120
VAC
polarity
Check polarity of power supply. If hot and neutral wires are reversed,
flame rod circuit cannot sense flame correctly. Control will lockout after
the trial for ignition.
