Install Instructions

86
13 Troubleshooting
Table 13-3 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FAULT DESCRIPTION CORRECTIVE ACTION
O˞˝˕ˎ˝ ARHL
The outlet water temperature has exceeded
the setting of the automatic reset high limit.
• Adjust the set point of the auto reset limit to a higher
setting up to a maximum of 200°F. Reference Section
11 - Operating Information for adjusting procedures.
• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the boiler is piped properly into the heating
system. Refer to Section 6 - Hydronic Piping
for the proper piping methods for the Lochinvar
Combi Boiler.
• Check 120 vac to boiler pump motor on a call for
heat. If voltage is not present, check wiring back to
the main control board.
• Replace the main control board if necessary.
• If 120 vac is present on a call for heat and the boiler
pump is not operating, replace the pump.
• If operating on something other than an outlet sensor,
check temperature setting of the main control board.
• If the optional manual reset high limit has tripped,
check setting of the device.
• Check resistance of water sensors and compare to
Table 13-1A on page 83 of this manual. Replace
sensor if necessary.
• Check operation of diverter valve motor. Replace if
necessary.
A˒˛ P˛ˎ˜˜˞˛ˎ
Sˠ˒˝ˌˑ
(will require a manual
reset once the condition
has been corrected.
Press the RESET button
on the display to reset.)
Air pressure switch contacts are open.
• Check the wiring connections to switch. Wires should
be connected to the common and normally closed
terminals.
• Air intake lengths exceed the maximum allowed
lengths. Refer to Section 3 - General Venting
for proper lengths.
• Check for obstruction or blockage in the air
intake pipes or at terminations.
• Check reference hoses connected to the air pressure
switch for blockage or obstruction.
• Inspect the burner. Reference page 79 of this manual
for removal and cleaning procedures. Replace if
necessary.
• Inspect the heat exchanger. Reference page 80 of
this manual for removal and cleaning procedures.
• Faulty air pressure switch. Replace switch.
AUX L˒˖˒˝ Fˊ˞˕˝
Aux limit device open.
• Check wiring to aux limit device.
• Check aux limit device.
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