Lochinvar 151 - 801 Service Manual page 32

3
Troubleshooting
Table 3F (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface
FAULT
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.)
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.)
32
DESCRIPTION
The actual fan RPM is 30% lower than what
is being called for.
Blown fuse.
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.
Outdoor Armor Water Heater Service Manual
CORRECTIVE ACTION
• Vent/air intake lengths exceed the maximum allowed
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 24 of
this manual.
• Vent/air intake lengths exceed the maximum allowed
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 26 of this
manual.
• Replace the sensor if necessary.