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SERVICE & TROUBLESHOOTING
WARNING
When servicing or repairing this equipment, use only
factory-approved service replacement parts. A complete
replacement parts list may be obtained by contacting Modine
Manufacturing Company. Refer to the rating plate on the unit
for complete unit model number, serial number, and company
address. Any substitution of parts or controls not approved by
the factory will be at the owner's risk.
Table 52.1 - Troubleshooting
Trouble
Pilot does not light
Main burners do not light (Pilot is lit)
Lifting Flames (See Figure 52.1)
Yellow Tipping
(With propane gas, some yellow tipping is
always present.)
Flashback
(Continued next page)
Figure 52.1 - Lifting Flame Condition
52
Do not reuse any mechanical or electrical component which
has been wet. Such component must be replaced.
To check most of the Possible Remedies in the troubleshooting
guide listed in Tables 52.1 and 53.1, refer to the applicable
sections of the manual.
Possible Cause
1.
Main gas is off.
2.
Power supply is off.
3.
Air in gas line.
4.
Dirt in pilot orifice.
5.
Gas pressure out of proper range.
6.
Pilot valve does not open.
a. Defective ignition controller.
b. Defective gas valve.
7.
No Spark at ignitor.
a. Loose wire connections.
b. Pilot sensor is grounded.
c. Defective ignition controller.
8.
Safety device has cut power.
1.
Defective valve.
2.
Loose wiring.
3.
Defective pilot sensor
4.
Defective ignition controller.
5.
Improper thermostat wiring.
1.
Too much primary air.
2.
Main pressure set too high.
3.
Orifice too large.
1.
Insufficient primary air.
2.
Dirty orifice.
3.
Misaligned orifice.
1.
Too much primary air.
2.
Main pressure set too high.
3.
Orifice too large.
5-594.10
CAUTION
IMPORTANT
Possible Remedy
1.
Open manual gas valve.
2.
Turn on main power.
3.
Purge gas line.
4.
Check for plugged pilot orifice and clean
with compressed air if necessary.
5.
Adjust to a minimum for Natural Gas - 6"
W.C. Minimum for Propane Gas - 11"
W.C. Maximum 14" W.C.
6.
Check wiring for 24 volts to valve.
a. Replace ignition controller.
b. Replace gas valve.
7
a. Check all ignition controller wiring.
b. Replace sensor if cracked or worn
c. Replace ignition controller.
8.
Check all safety devices (High limit, air
flow proving switch, power exhauster
centrifugal switch, gas pressure switches,
etc.) Determine and correct problem.
Reset if necessary.
1.
Replace valve.
2.
Check wiring to gas valve.
3.
Replace pilot sensor.
4.
Replace ignition controller.
5.
Verify wiring compared to wiring diagram.
1.
Reduce primary air.
2.
Adjust to a maximum of 14" W.C.
3.
Check orifice size with those listed on the
serial plate.
1.
Increase primary air.
2.
Check orifices and clean with compressed
air if necessary.
3.
Check manifold, replace if necessary.
1.
Reduce primary air.
2.
Adjust to a maximum of 14" W.C.
3.
Check orifice size with those listed on the
serial plate.
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