LAARS IGE-199C-5(N,X) - Service Manual - Manual (Page 40)

40
Combustion stops due to flame failure
1) Is the flame rod functioning normally?
2) Is the earth lead wire connected?
a. Measure the voltage between the flame rod
terminal C
1
and the appliance earth.
Normal: 5 – 150 VAC from yellow to ground.
If normal, check b below.
Faulty: Replace the PCB unit.
(Service Procedure IGE-2, page 47)
b. Check that the flame rod attachment is not loose.
Normal: Replace the PCB unit.
(Service Procedure IGE-2, page 47)
Faulty: Secure the flame rod bracket.
a. Check for defective earth terminal, or an open
circuit or short. If normal, investigate other
possible causes for the flame failure.
(Eg. Is the gas valve open ? Is the filter mesh
blocked ?) Was proper venting material used?
Did you regulate your gas supply pressure to the
proper gas pressure for gas type being used?
Faulty: Ensure unit is properly grounded. Check
ground circuit outside home at service pole.
There should be an eight foot ground rod driven
in the earth and a copper lead tied to the service
meter. Ensure connection on ground rod is tight.
Error code “14” Check the thermal fuse.
a. # Disconnect connector B3 and C3, measure the
resistance between the red – red wires.
Normal: Less than 1 Ω
If normal, check b below.
Faulty: Check manifold gas pressure. Check heat
exchanger for cracks and/or separations. If there is
nothing abnormal, replace the thermal fuse.
(Service Procedure IGE-11, page 51)
b. Check bi-metal switch, (remaining flame safety
device). Measure resistance between the two
terminals at B3 and C3.
Normal: Less than 1 Ω
If normal, process to item a below.
Faulty: Replace the bi-metal switch.
VI - TROUBLESHOOTING (cont.)
BEFORE CARRYING OUT CHECKS MARKED WITH A # SIGN, DISCONNECT THE POWER SUPPLY.