Lochinvar ARMOR 150 - 800 Service Manual page 29

3
Troubleshooting
Table 3E (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT
Fan High
OR
Fan Speed High
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Sensor Open
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Sensor Shorted
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Aux. Proving
(will require a manual
reset once the condition
has been corrected. Press
the RESET button on the
SMART SYSTEM display
to reset.)
Temp O/Shoot
(continued)
DESCRIPTION
The actual fan RPM is 30% higher than what
is being called for.
Either the inlet water or outlet water
temperature sensor has been disconnected.
Either the inlet water or outlet water
temperature sensor has been shorted.
An optional remote proving switch is not
making.
The flue temperature has exceeded the set
parameters for the water heater.
Scaling has reduced water flow.
CORRECTIVE ACTION
• 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.
• Check the sensors and their associated wiring.
Repair or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables on page 23 of this
manual.
• Replace the sensor if necessary.
• Check the sensors and their associated wiring.
Repair or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables on page 23 of this
manual.
• Replace the sensor if necessary.
• Check function of remote devices.
• Check for loose or misplaced jumper if auxiliary
proving switch is not installed.
• Inspect the heat exchanger. Reference page 20 of
this manual for the procedure on how to clean the flue
side of the heat exchanger.
• Inspect the flue sensor and associated wiring.
Measure the resistance of the flue sensor and
compare to Table 3C on page 23 of this manual.
Replace the sensor if necessary.
• Verify that the vent/air intake pipes are properly
installed and that there are no obstructions.
• Replace the main control board.
• Deliming may be required.
Service Manual
29