Troubleshooting Chart - Fault Messages - Lochinvar Power-fin 502 Service Manual

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Troubleshooting
Table 3F Troubleshooting Chart - Fault Messages Displayed on Operator Interface
F F A A U U L L T T
Gas Pressure SW
(Will require a manual
reset once the condition
has been corrected.)
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.)
Blocked Drain SW
(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)
Flame Sequence
(Will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Anti-cycling
(continued)
D D E E S S C C R R I I P P T T I I O O N N
Either the optional manual reset low gas
pressure switch or the optional manual reset
high gas pressure switch tripped.
Either the flow switch or the optional low
water cutoff is not making.
The blocked drain switch has detected
excessive condensate build up inside the
unit.
The flame detector circuit is seeing a flame
signal while no flame is present.
The main control board has received a call for
heat too quickly after the previous call for
heat has ended.
C C O O R R R R E E C C T T I I V V E E A A C C T T I I O O N N
• Reset the pressure switches.
• Measure the supply gas pressure to determine
cause of failure. Refer to Section 3 - Gas
Connections of the Power-fin Installation and
Operation Manual for
concerning the gas supply.
• Correct the supply gas pressure if necessary.
• 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.
• Check condensate tube from unit to floor drain for
proper installation and obstructions.
• Inspect condensate trap for blockage.
necessary.
• Check for loose wiring connection at wire harness
plug.
• Bad blocked drain switch. Replace switch.
• Check supply voltage for proper polarity.
• Check external wiring for voltage feedback.
• Check the internal wiring for bad connections.
• Replace main control board.
• 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.
Service Manual
detailed information
Clean if
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