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TROUBLESHOOTING
Table 10.1 (cont.): Lockout Errors
Error
Error Display
Number
33
LWCO_1_ERROR
34
LWCO_2_ERROR
APS_NOT_CLOSED_IN_POST_
35
PURGE
36
GAS_PRESSURE_ERROR
37
AIR_DAMPER_LOCKING
38
FLUE_PRESSURE_LOCKING
60
Low water cut off error.
– Check system for leaks and filling valve for operation, ensure there is no air in the system.
– Check wiring to LWCO probe and that the connector to the probe is securely attached.
– Check grounding to piping where the LWCO probe is installed
Low Water Cut-Off 2 error.
Air Pressure Switch is not closing during post-purge cycle.
Gas pressure switch is open for more than E2_GPS_Timeout
– Is the gas pressure within the range listed on the nameplate?
– Press the reset buttons on each of the gas pressure switches located on the gas line inside
the jacket.
More than 3 consecutive Air_Damper_Error have occurred.
More than 3 Blocked Flue/ Condensate Switch in 24 hours.
– Check for blockages in the vent pipe or heat exchanger.
– Check for blockages in the condensate system inside or after the condensate trap. A slow
drainage of condensate could cause condensate back up that will trip this switch under
certain conditions.
Corrective Action
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