gledhill GB10 Installation And Servicing Instructions page 36

9.2. Spark & Flame sensing Electrodes
For access refer to section General 9.1
Remove the spark plug style connector from the electrode and earth lead in the case of the spark electrode.
Remove the two retaining screws with a Torx T20 driver, carefully withdraw the electrode from the
combustion chamber.
9.3. Ignition & Flame sensing Leads
For access refer to section General 9.1
Pull off the spark plug style connector off the electrode and the spade connector from the control pcb.
9.4. Fan
For access refer to section General 9.1 & 9.1.1
Remove the two slotted screws holding the gas valve and venturi to the fan then remove the four nuts
securing the fan to the gas manifold with a 8mm AF spanner. Check and replace any seals and gaskets
necessary.
9.5. Burner
For access refer to section General 9.1 & 9.1.1. Remove the three screws securing the gas manifold to the
combustion chamber front with a Torx T25 driver. This will release the burner.
The burner size depend upon the model of the boiler (see table below) therefore when replacing the burner
ensure that the correct replacement burner is used.
Gledhill Boiler
model
GB10
GB15
GB20
GB25
GB30
9.6. Temperature Sensors
For access refer to section General 9.1
The flow and return sensors have built in retaining clips and are removed as follows. Remove the
electrical connections from the sensor, the sensor is removed from the pipe by putting equal pressure
on the sensor head and the clip ends that are located 180
removed with a 15mm AF spanner after having its electrical connections removed.
9.7. Heat exchanger
For access refer to section General 9.1 & 9.1.1
After removing the burner sub-assembly drain the boiler and remove the condense pipe from the
bottom of the heat exchanger. Remove the clips securing the flow and return connections onto the
heat exchanger. Loosen the three heat exchanger securing screws and clamps (two at the top and
one at the bottom) to remove the heat exchanger. CAUTION there will still be some water in the heat
exchanger.
VER: 02.3 _260505
Supplied By www.heating spares.co Tel. 0161 620 6677
Burner length Gledhill Part
(mm) number
104.6 221.022.001-B
135.8 221.023.001-B
167.0 221.024.001-B
167.0 221.024.001-B
Gas Council number
o
from each other. The flue gas sensor is
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