7
AT THE BOILER, REMOVE THE FRONT COVER AND CHECK THE FOLLOWING:
The 2 white modulation solenoid wires are connected
The spark generator is attached to the gas valve correctly
Both the H.T leads from the spark generator are attached correctly
Look for wires and components not connected or plugged incorrectly, especially the
clip on central heating thermistor which should be attached to the heating flow pipe
and not the gas pipe!
IMPORTANT: Boilers with serial numbers 050410747 onwards will have the central
heating thermistor located on the left hand side of the main heat exchanger.
Important Things You Will Find in the Technical and Faultfinding Manual
Domestic Hot Water Ignition Sequence (Page 28)
This flow diagram represents the general operating system in the domestic hot water
mode and the sequence of events if temperatures exceed the specified limits which are
pre-determined by the PCB.
Central Heating Ignition Sequence (Page 29)
This flow diagram represents the general operating system in the central heating mode
and the sequence of events if temperatures exceed the specified limits.
Please note that following the initial 30 seconds of minimum output, modulation may not
occur for a further 5 minutes if the central heating logic programme is operating. This is
because the boiler will not fire on full power if it has detected it is serving a system with a
low load. This is the case in most caravan holiday homes. For more detailed information
please see the note on central heating logic programme. (Page 25)
Lighting Up Sequence Flow Diagram (page 27)
The lighting up sequence is common for both the central heating and domestic hot water
modes. Once the flame is established the relevant regulation on modulation takes place.
Explanation of Self-Diagnostics (Page 30)
Whenever a fault develops in the boiler that is likely to affect its safe operation it will lock
out and show a fault code via a flashing sequence on the red LED on the control panel.
Lock out faults will require a component to be replaced or service work to be carried out.
Identify the fault by reading the flashing LED sequence (self diagnostic fault code). Each
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