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LAARS U.H.E. - Service Manual User Manual

Page 17

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U.H.E Service Manual

Page 17

Thermostat Sensor (Thermistor) Replacement Procedure

Step 5.

Fold back insulation just in front of burner to

expose temperature sensor (see photo below).

Step 6.

Disconnect temperature sensor from

harness (see photos at right).

Step 7.

Remove temperature sensor (1-1/16" hex, deep well socket) from heater.

Note:

Using a deep well socket will allow room inside socket

for sensor connector and wires.

Step 8.

Apply thread sealing tape or applicable thread lubricant to threads of new sensor. Install new thermostat

sensor and Connect to wire harness from step 6.

Step 9.

Fold insulation back into place. Be sure there are no wires in contact with burner.

Step 10. Restore 120 volt power supply and water supply to water heater, check and repair any

leaks found. Confirm proper operation following the lighting instructions on the lighting

instruction label or the lighting instruction located in the installation and operating

instruction manual.

Step 11. Replace surround cover on top of heater.

Step 1.

Position main power switch to “OFF”

Step 2.

Disconnect (unplug) water heater from

120 volt power source.

Step 3.

Drain water heater down to a point below the

top of the tank.

Step 4.

Un-latch and remove top surround cover

from top of heater.

WARNING

120 volt potential exposure. Isolate the

appliance and reconfirm power is

disconnected using a multi-meter.

17

Disconnect sensor

from harness

Hot Surface Ignition Models

Insulation folded back

to expose temperature

sensor