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Maintenance
43
1300003 (EN)
Troubleshooting Hot Surface
Ignition Module
(120 Volt Gas Models Only)
IMPORTANT:
1. The following service procedures are
provided as a general guide.
2. Meter readings between gas control and
ignition module must be taken within the
trial for ignition period. Once the ignition
module shuts off, wait for retry or reset at
the thermostat.
3. If any component does not function
properly, make sure it is correctly installed
and wired before replacing it.
4. The ignition module cannot be repaired. If
it malfunctions, replace it.
5. Only trained, experienced service
technicians should service hot surface
ignition systems.
6. After servicing, verify proper system
operation.
Perform the checkout steps in the First Start-Up
section as the first step in troubleshooting. Then check
the troubleshooting sequence to determine the exact
cause of the problem. Refer to Figure 37.
After troubleshooting, perform the first start-up
procedure again to be sure the system is operating
normally.
Status LED Used to Troubleshoot
The LED can be used to check the finisher status. A
description of the LED signals follows.
IMPORTANT: The LED shows system status for
the current call for heat. When the call for heat is
interrupted (thermostat satisfied or system power
switched off), the LED goes off and the status
information is lost.
• Pulsing heartbeat is the normal operating mode
during a call for heat (24V terminal is powered).
The system can be in any of the normal operating
modes including prepurge, warmup, ignition
trial, between trial purge, or normal run.
• One flash indicates the ignition module is in an
ignition lockout mode. The most probable cause
is the main burner failing to light or failure to
detect the flame. Run the finisher through a call
for heat and if the burner does not light, check the
following:
– Gas supply
– Input voltage
– Hot surface igniter
– Gas control
– Wiring
• If the main burner lights, but goes out at the end
of the ignition trial, check the following:
– Igniter/sensor
– Flame rod
– Burner ground connections
– Wiring
• Two flashes indicates the flame rectification
signal is weak. The most probable causes are:
– Contaminated or mislocated igniter/sensor or
flame rod
– Poor flame sense leadwire insulation or
connections
– Poor gas pressure
• If the flame rectification signal is strong when the
finisher lights, but weak while heat is being
delivered, check for overheating of the igniter/
sensor, flame rod ceramic or flame sense
leadwires.
• Three flashes indicate an internal error. The most
probable cause is an ignition module logic
failure. Start a new call for heat and if the three-
flash signal returns, replace the ignition module.
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