Lochinvar 81-286 service manual Sensor Shorted, Louver Proving, Inlet Sensor, Fault, Outlet Sensor

FAULT

DESCRIPTION

CORRECTIVE ACTION

Sensor Shorted

• Check the sensors and their associated wiring.

Repair or replace the sensor or wiring if damaged.

(will require a manual reset

Either the inlet water or outlet water

• Measure the resistance of the sensors and compare

once the condition has been

corrected. Press the RESET

temperature sensor has been shorted.

the resistance to the tables on page 35 of this

button on the SMART

manual.

SYSTEM display to reset.)

• Replace the sensor if necessary.

Louver Proving

Sw

• Check function of remote devices.

(will require a manual reset

An optional remote proving switch is not

once the condition has been

making.

• Check for loose or misplaced

jumper if auxiliary

corrected. Press the RESET

proving switch is not installed.

button on the SMART

SYSTEM display to reset.)

Inlet Sensor

• Check wiring to sensor. Make sure wiring is

connected and not damaged.

Reconnect / repair

Fault

wiring if necessary.

(will require a manual reset

The control reads the inlet sensor as open

• Measure the resistance of the sensor and compare to

once the condition has been

corrected. Press the RESET

or shorted.

the resistance in Table 3-2A on page 35 of this manual.

button on the SMART

Replace sensor if necessary.

SYSTEM display to reset.)

• Replace control module.

Outlet Sensor

• Check wiring to sensor. Make sure wiring is

connected and not damaged.

Reconnect / repair

Fault

wiring if necessary.

(will require a manual reset

The control reads the inlet sensor as open

• Measure the resistance of the sensor and compare to

once the condition has been

corrected. Press the RESET

or shorted.

the resistance in Table 3-2C on page 35 of this manual.

button on the SMART

Replace sensor if necessary.

SYSTEM display to reset.)

• Replace control module.

• Check wiring to sensor. Make sure wiring is

connected and not damaged. Reconnect / repair

Outlet Temp Diff

wiring if necessary.

• Measure the resistance of the sensor and compare to

(will require a manual reset

The control module reads an excessive

once the condition has been

temperature difference between the two

the resistance in Table 3-2C on page 35 of this manual.

corrected. Press the RESET

sensors.

Replace sensor if necessary.

button on the SMART

• Restore control parameter defaults from optional PC

SYSTEM display to reset.)

software.

• Replace control module.