SERVICING

SERVICING

63 OVERHEAT THERMOSTAT REPLACEMENT

1.

Refer to Frame 61.

4.

Pull off the electrical connections at the thermostat. Remove

2.

Remove the control box fixing screws.

 

the backnut retaining the thermostat to the casing. Withdraw

 

the thermostat phial from the heat exchanger pocket and

3.

Swing the control box down into the servicing position.

 

 

unclip from the casing.

 

 

5.

Fit the new thermostat and reassemble in reverse order.

 

 

6.

Check the operation of the boiler. cla7742

cla7849

64 THERMOSTAT CONTROL, THERMISTOR SENSOR LEAD & ON/OFF SWITCH REPLACEMENT

Refer also to Frame 61.

A. Remove the control box fixing screws

B.Swing the control box down into the servicing position.

Thermostat control

1. Pull the knob off the shaft.

2.Remove the backnut securing the thermostat control to the control

box.

3. Pull off the Molex connector from the printed circuit board.

4.Replace and reassemble in reverse order.

Thermistor sensor lead

5. Pull the sensor lead connector off the printed circuit board and cut the cable strap

securing the thermistor harness to the bottom panel of the control box (if fitted) and remove the strap.

6. Remove the sensor from the

heat exchanger pocket and

unclip from the casing.

7. Remove the strain relief bush

from the back panel base.

8. Remove the sensor lead through the grommet in the

control box.

9. Replace and reassemble in reverse order, ensuring the new cable strap is fitted and securing the thermistor harness.

On/off switch

10.Disconnect the electrical connectors from the rear of the switch.

11.Press in the 2 side retaining clips and remove the

switch.

12. Reassemble in reverse order.

36

classic HE - Installation & Servicing

Page 36
Image 36
IDEAL INDUSTRIES HE9 Servicing Overheat Thermostat Replacement, Thermostat control, Thermistor sensor lead, On/off switch

HE12, HE15, HE18, HE9 specifications

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