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GNA-2538 R0
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7.2. Heater Troubleshooting Guide
Never check for a spark without first shutting off the fuel supply and purging all fuel from the
system.
Purge the fuel system by shutting off the fuel supply, starting the fan, and cycling the burner
ignition sequence 2 to 3 times. This will open the solenoids allowing fuel trapped in the
plumbing to exit.
Table 5.
Problems, Causes and Solutions
Problem
Check
Possible Cause
Solution
No Power
Power Circuit
Open Circuit
Ensure power coming from Fan
interlock (120V) is present at power
terminals
Check if 3 Amp fuse is blown
Heater does not light
or, No spark at
burner
Check 3 Amp fuse
Fuse blown
Replace 3 Amp fuse
Burner control
Malfunction
Fenwal DSI Module
Check connections or replace DSI
Make certain the burner is calling for
heat
Burner hi limit switch
defective
Disconnect wires from switch and run
continuity test, if none replace switch
Burner hi limit
tripped
Switch is tripped out
Reset, if switch continues to trip
correct hi heat problem or replace
switch
Ignition wire
Damaged or loose
connection
Inspect and correct problem or
replace if damaged in any way
fuses
Blown 1.5 Amp fuse
Replace
Blown 3 Amp fuse
Replace
Ignitor
Excess carbon
Clean electrodes with steel wool
Incorrect ignitor gap
or position
Set gap to 0.07" (1.8mm), correct the
position if required
Cracked or broken
porcelain body
Replace
Grounded Ignitor
Ensure that ignitor is not grounded
(touching burner)
Neutral wire
Faulty connection(s)
Check for continuity between neutral
and ground, should be none, voltage
between neutral and hot should be
~115V
Burner operates for
only a few seconds
Flame probe
Improper location or
bad connection
Relocate to original position
Verify wiring connections are secure
Burner operates for
only a few minutes
Static Pressure
Static Pressure too
high
Reduce static pressure remove some
grain from bin
AXIAL FAN HEATER – LP AND NG-FIRED HEATER