Table U: Ignition Module Diagnostic LED Flash Codes
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
High Limit—Manual Reset
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. 37: 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.
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.
Flow Switch
This 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. 38: Adjustable High Limit (Auto Reset)
Fig. 39: Flow Switch
California Hot Water Supply, Inc.
(800) 249-7244
37
