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3 Troubleshooting (continued)
37
FAULT DESCRIPTION CORRECTIVE ACTION
Gas Pressure SW
(Will require a manual
reset once the condition
has been corrected.)
- Either the optional manual reset low gas
pressure switch or the optional manual reset
high gas pressure switch tripped.
- Models 992 - 2072 (natural gas) - Automatic
Reset Low Gas is open.
• Reset the pressure switches.
• Measure the supply gas pressure to determine
cause of failure. Refer to the Gas Connections
Section of the Installation and Operation Manual for
detailed information concerning the gas supply.
• Correct the supply gas pressure if necessary.
Flow Switch/
LWCO
(Lockout will reset
automatically after
5 minutes or may be
reset immediately once
condition has been
corrected. Press the
RESET button on the
SMART SYSTEM display
to reset.)
Either the flow switch or the optional low
water cutoff is not making.
• Check pump operation on a call for heat.
• Check for closed valves or obstructions in the
water piping.
• Verify system is full of water and all air has been
purged from the system.
Flame Sequence
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM
display
to reset.)
The flame detector circuit is seeing a flame
signal while the gas valve is de-energized.
• Check supply voltage for proper polarity.
• Check that the gas valve is closed.
• Check external wiring for voltage feedback.
• Check the internal wiring for bad connections.
• Replace main control board.
Anti-cycling
The main control board has received a call
for heat too quickly after the previous call for
heat has ended.
• The control board will release the call for heat after
a set time period.
• The control board will release the call for heat if the
outlet temperature drops too quickly.
Table 3E Troubleshooting Chart - Fault Messages Displayed on Operator Interface
Copper-fin II/IIE Boiler and Water Heater Service Manual