56
Error Code
Definition of Code
Cause of Problem and Actions Taken to Correct
93
DHW Sensor Fault
(Domestic Hot Water)
•
Check the sensor wire harness from the DHW sensor to the control
module to ensure there are no loose connections or breaks in the wires.
•
Check the resistance reading from each of the outside wires to the
center (common) wire.
•
If the ohm readings are not fairly close, replace the sensor.
•
Replace the control module if the problem persists and the sensor and
wire connections are not defective.
105
Flame detected out of
sequence
•
Check to see if flame is present inside the combustion chamber before
or after the ignition cycle.
•
If so, check to make sure the gas valve is wired correctly.
•
Check for voltage at the gas valve connection.
•
Replace the gas valve if defective.
•
If no flame is visible outside of the ignition sequence/run cycle, then
make sure the flame sensor is wired to the correct terminal.
•
Make sure the ignition cable is not crossing the flame sensor wire or
ignition ground wires.
•
If problem persists and all other checks have been verified, replace the
control module.
110
Ignition failure
occurred
•
Burner failed to light or stay lit after 3 retries.
•
Hold condition
– will reattempt ignition after 1 hour waiting period.
•
Check gas valve wiring and gas valve operation during the ignition
cycle.
•
If burner lights but quickly goes out, check the flame sensor wire or the
flame sensor.
•
If the flame sensor rod is badly corroded with deposits, clean with steel
wool or replace.
•
Check the inlet gas supply to make sure the pressure is sufficient and
does not drop
more than 2” to 3” after gas valve opens.
•
Make sure the combustion blower is operating during the ignition and
run cycle.
•
Check the venting system to make sure the inlet and exhaust terminals
and venting system is not blocked.
122
Light-off rate proving
failed (hard lockout)
•
If blower speed is not verified from the PWM (Pulse Width Modulation)
signal within 5 minutes, the previously described error code “62”
changes from a hold condition to this lockout code condition.
•
Check the harness and pin terminals for a good connection to the
control module.
•
Replace the blower or control module if the wire harness is good.
123
Purge rate proving
failed
•
If blower speed is not verified from the PWM (Pulse Width Modulation)
signal within 5 minutes, the previously described error code “62”
changes from a hold condition to this lockout code condition.
•
Check the harness and pin terminals for a good connection to the
control module.
•
Replace the blower or control module if the wire harness is good.
137
Interlock off
•
Check wiring and correct any possible shorts.
•
Check Interlock (ILK) switches to assure proper function.
•
Verify voltage through the Interlock string to the Interlock input with a
voltmeter.
•
If steps 1-3 are correct and the fault persists, replace the control
module.
Содержание EF120T
Страница 42: ...42 Lighting and Shutdown Instructions Figure 31 Lighting Instruction Label...
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