PROBLEM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
HOT SURFACE IGNITER
NOT GLOWING
FOLLOWING WARM-UP
PERIOD
120VAC polarity reversed at 120VAC outlet
receptacle
Defective hot surface igniter
Defective gas control valve/thermostat
1.
2.
3.
Reverse polarity at 120VAC outlet
receptacle
Replace igniter
Replace gas control valve/thermostat
1.
2.
3.
VENT PIPE TOO HOT
(ABOVE 149° F)
Blower does not run when heater
fi
red
Not enough dilution air to mix with
fl
ue
gases
Air in room too hot for mixing with
fl
ue
gases
Wrong burner ori
fi
ce
Baf
fl
e incorrect or missing
1.
2.
3.
4.
5.
Refer to “BLOWER WILL NOT START”
problem
Proper air circulation must be provided for
combustion and dilution of
fl
ue temp
Room air to be used for dilution with
combustion products in
fl
ue should be less
than 90°F
Install correct ori
fi
ce.
Contact water heater supplier
1.
2.
3.
4.
5.
ECO Reset
Reseting a High Limit (Thermal Cutout, ECO) trip requires
manual intervention and can not be reset by cycling power to
the control. A manual reset requires turning the temperature
setting dial to the lowest (coldest) position for a minimum of 10
seconds and then returning it to the desired setpoint. A manual
reset is allowed after each of the
fi
rst two ECO trips. After a
third ECO trip, the control enters a hard lockout state.
Ignition State and Timing
IGNITION STATE
TIMING
Pre-purge
5 seconds (NG models)
15 seconds (LP models)
HSI Warmup
10 seconds
Ignition Activation
Period (IAP)
3.5 seconds maximum
Flame Recognition
Period (FRP)
0.5 second
Trial For Ignition
IAP + FRP
Flame Stabilization
Period
Not Applicable
Inter-purge
30 seconds
Flame Failure
Response Time
2 seconds max
(@ 1uA
fl
ame current)
Post-purge
30 seconds
PS Prove Period
2 minutes
PS Fault Delay
(failed open/closed)
2 minutes
Soft Lockout
20 minutes
TCO Limit Lockout
Inde
fi
nite (follow de
fi
ned
procedure to restart)
Flammable Vapour
Sensor Lockout
Inde
fi
nite (follow de
fi
ned
procedure to restart)
Hardware Fault Lockout
Inde
fi
nite (clear fault to restart
in 15 seconds or less)
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