39
TableT: Ignition Module Diagnostic LED Flash Codes
Code Condition
On System OK; No faults present
Off Possible control fault; Check power
1Flash Low air
2Flashes Flame in combustion chamber;
No call for heat
3Flashes Ignition lockout
4Flashes Low HSI current
5Flashes Low 24 VAC
6Flashes Internal fault; Replace control
This 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 (20°C)
above desired outlet temperature.
Fig. 42: High Limit (Manual Reset)
High Limit—Auto Reset (Optional)This heater may be equipped with an optional adjust-
able auto reset high limit temperature device.
For H and WH systems, the optional adjustable auto
reset high limit is located inside the heater junction
box. Adjust the setting to approx. 20°F (10°C) above
desired outlet temperature.
For Pool installations, the auto limit must be located to
sense the water temperature in the main line (see Fig.
17). Adjust the setting no higher than 110°F.
Flow SwitchThis standard, dual-purpose control, mounted and
wired in series with the main gas valve, shuts off the
heater in case of pump failure or low water flow.
Fig. 43:Adjustable High Limit (Auto Reset)
Fig. 44: Flow Switch