Corrective Action - Lochinvar ARMOR 150 - 800 Service Manual

3
Troubleshooting
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT
Manual Reset
High Limit
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Fan Low
OR
Fan Speed Low
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
APS
Open
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
28
DESCRIPTION
The outlet water temperature has exceeded
the fixed setting of the manual reset high
limit.
The actual fan RPM is 30% lower than what
is being called for.
Blown fuse.
Air pressure switch contacts are open.

CORRECTIVE ACTION

• Verify that the system is full of water and that all air
has been properly purged from the system.
• Verify that the water heater is piped properly into the
heating system. Refer to Section 6 - System Piping
of the Armor Water Heater Installation and Operation
Manual for the proper piping methods for the Armor
water heater.
• Check 120 VAC to water heater 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 water
heater pump is not operating, replace the pump.
• If the manual reset high limit has tripped, check
setting of the device.
• Check resistance of water sensors and compare to
Table 3B on page 23 of this manual. Replace sensor
if necessary.
• Replace high limit.
• Vent/air intake lengths exceed the maximum allowed
lengths. Refer to Section 3 - General Venting of the
Armor Water Heater Installation and Operation
Manual for proper lengths.
• Check for obstruction or blockage in the vent/air
intake pipes or at terminations.
• Check the wiring connections at the fan and at the
main control board.
• Replace the fan.
• Replace the main control board.
• Replace fuse F4 on the control board, see page 21 of
this manual.
• 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 of the
Armor Water Heater Installation and Operation
Manual 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 19 of this manual
for removal and cleaning procedures.
necessary.
• Inspect the heat exchanger. Reference page 20 of
this manual for removal and cleaning procedures.
Replace if necessary.
• Faulty air pressure switch. Replace switch.
Service Manual
Replace if