13 Fault Finding
7891
RESET BUTTON
INSTRUCTION LABEL
Diagram 13.4
4067 S
RESET
BUTTON
FLUE HOOD
OVERHEAT
THERMOSTAT
Diagram 13.5
14 Replacement of Parts
Notes:
Replacement of parts must be carried out by a competent person.
Before replacing any parts isolate the boiler from the electrical supply and turn the gas supply off at the gas service cock, see diagram 8.1.
Unless stated otherwise, all parts are replaced in the reverse order to removal.
After replacing any parts always test for gas soundness and if necessary carry out functional check of controls.
For the following the front case and inner case cover will need to be removed, diagrams 5.2 and 5.3.
14.1 Spark Electrode
Replace as described in Section 12.4.
14.2 Ignition Lead: diagram 14.2
Release the control box as Section 9.
To disconnect the ignition lead from the control board, remove the PCB from the mounting pegs, the front two have detachable grips, the rear two are plain supports.
When refitting lead make sure that there is enough length through the gland plate assembly.
Condensate Sensor: diagram 14.2
Refer to the relevant part of Section 14.2 to remove the screw.
The sensing screw is fitted to a push fit cap which can be levered off for easy access.
Note. The condensate flexible tube is a push fit and can be removed from the condensate drain trap to improve access to the screw.
When replacing the cap make sure that it is firmly in place and that the ring tag is pointing away from the casing side.
SECURING | CONDENSATE FLEXIBLE | 5549 | |
SCREW (2) | TUBE | ||
|
SPARK
ELECTRODECONDENSATE 
DRAIN CAP
IGNITION
SENSING
LEAD
Diagram 14.2
33 | 221834B |
