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Thanks to kevplumb and gasguru for this solution, replaced both throttle valves, boiler and CH working perfectly. Regards Nigel.

Well many thanks for all the help over the weekend. Based upon the above I have ordered two new throttle switches tonight (£33), should arrive 3-5 days. In the meantime I will leave the boiler switched off overnight and when not in use. Will check the resistance and drain, clean and...

The mains water enters the boiler via a shut off valve and into the base of the LHS Throttle Assy. I had therefore assumed that this was controlling the DHW side. Is this incorrect? Anyway here are the results... If I disconnect the RHS sensor and select HW only the pump doesn't run and...

OK thanks, I have downloaded the GA for the boiler and BOM. Is the DHW flow switch also referred to as the Water Throttle? If so there are two identical flow (throttle) switches, looking at the hydraulic block from the front is the DHW throttle on the LHS? I assume its full of crud...

My CH system is running even when the CH side is switched off. The electronic programme unit is in the off position and the OFF/HW/CH selector switch on front LHS of the boiler is in the HW only position. However the boiler pump appears to be running all the time and the burner is firing...

Great news, very straight forward, will replace ASAP, thanks.

My C&M Britony Combi 80 has developed a leak, on removing the front panel it looks as though the leak is coming from a pressure valve (Brass cylinder with red plastic screw cap, bottom RHS). There is a continious slow seepage from the top of this unit, looks as though it has been leaking fo some...