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56. The stage 4 temperature controller contacts close.
57. Power is sent to gas valve 4.
58. The heater is now operating at full fire.
Fig. 29: Ignition Module
Ignition Module
When additional heat is needed, the combustion air
blower starts to purge air from the combustion cham-
ber for about 15 seconds. On proof-of-air flow, the air-
proving switch closes and the igniter is energized. To
ensure safe operation, the gas valve cannot open until
the igniter is verified. The main burner is automatically
lit when the device is powered and pre-purged. The
heater performs its own safety check and opens the
main valve only after the igniter is proven to be capable
of ignition.
Code
On
Off
1 Flash
flashing normal on start-up
2 Flashes
3 Flashes
4 Flashes
Low 24 VAC, check control
5 Flashes
6 Flashes
Table O: Ignition Module Diagnostic LED Codes
Reset button
on 1-try
module
Condition
System OK;
No faults present
Possible control fault;
Check power
Low air pressure, brief
Flame in combustion
chamber; No call for heat
Ignition lockout
Low igniter current
supply voltage
Internal fault;
Replace module
The standard ignition module will attempt to light three
times before locking out. To reset it, turn off power to
the heater, wait 30 seconds and re-apply power.
The optional single-try ignition module will lock out after
failing to light one time. To reset it, press and release
the small, recessed black push button located inside of
the cut-out on the lower right-hand corner of the igni-
tion module case (see Fig. 29). Turning off the power
to the heater WILL NOT reset the ignition module.
High Limit (Manual Reset)
The heater is equipped with a manual reset high limit
temperature device. Push the reset button and adjust
the setting to 40 - 50°F above desired operating tem-
perature.
Fig. 30: High Limit (Manual Reset)
Flow Switch
Fig. 31: Flow Switch
This dual-purpose control, mounted and wired in se-
ries with the main gas valve, shuts off heater in case of
pump failure or low water flow.
Operating Control
The heater may be equipped with different types of
operating controls. Consult the individual control data
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