Filter
Top Products
SECTION C: Installation
35
Fig. 29: Ignition Module
The standard 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 ignition module case. Turning off the power to
the heater WILL NOT reset the ignition module.
The optional 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.
Code Condition
On System OK; No faults present
Off Possible control fault; Check power
1 Flash Low air
2 Flashes
Flame in combustion chamber;
No call for heat
3 Flashes Ignition lockout
4 Flashes Low HSI current
5 Flashes Low 24 VAC
6 Flashes Internal fault; Replace control
Table O: Ignition Module
Diagnostic LED Flash Codes
High Limit - Manual Reset
The heater is equipped with a fixed setting manual re-
set high limit temperature device as standard or it may
have an optional adjustable setting manual reset high
temperature device.
The fixed setting manual reset high limit is located on
the In/Out header of the heat exchanger on the right
side of the heater (accessible through the front door for
reset as necessary).
The optional adjustable manual reset high limit is lo-
cated inside the heater junction box. Push the reset
button and adjust the setting to approx. 40°F above
desired outlet temperature.
Fig. 30: Fixed Setting & Adjustable High Limit
(Manual Reset)
High Limit - Auto Reset (Optional)
The heater may be equipped with an optional adjust-
able auto reset high limit temperature device.
The optional adjustable auto reset high limit is located
inside the heater junction box. Adjust the setting to
approx. 20°F above desired outlet temperature.
Fig. 31: Adjustable High Limit (Auto Reset)
Flow Switch
This standard, dual-purpose control, mounted and
wired in series with the main gas valve, shuts off heater
in case of pump failure or low water flow.