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Sorry but I was repying regarding to the ops first post.

If the heating system is wired correctely it is not possible for the pump to remain running when the spur fuse blows. are you sure that the fuse you refer to is the one for the electrical supply to the heating system?.

Try hydrogen peroxide

Ask them to change the motor capacitor. :wink: :wink: spraggo

It is a spring safety relief valve that used to be fitted as standard on old solid fuel boiler circuits, they are now obsolete. You will need to remove it and fit a 3/4 brass plug in it`s place if it is leaking. spraggo

Hi Peter If the motor keeps running and does not go to lock out it indicates that you need a new motor, as the 50v supply on the white wire from the motor is missing. spraggo

Run a seperate three core supply through the roof space. :wink: :wink:

The SMC control pack consisted of a circulating pump for the heating fitted to the boiler flow, on the outlet of this pump a SMC controller was fitted by means of a 3/4" barrel nipple to it`s inlet whilst it`s outlet connected to the rediator circuit. On the top of the controller casing was a...

Have you checked that the small head tank in the loft as got water in it, it should be about 1/3 full.

Go to: http://www.onlineboilerspares.com/WORCESTER%20FAN%2087161213720

http://www.newtooleng.com/search/?search=lockshield

I would suspect that the oil burner motor capacitor needs renewing. When you press the reset button or when you switch the boiler on do you hear a humming noise coming from the burner or does it hesitate before it starts up. spraggo

Your boiler contains two pumps, one for central heating and one for hot water and your symtoms indicate that the hot water pump is faulty, ei, not running at full speed. spraggo

I would suspect that the culprit is the DOT situated above the stop cock, check that the end of the spout as shown in photo 2, is not wet. spraggo

On the other hand it is quite possible that after thirty minutes the cylinder stat or room stat would shut the boiler down. :wink: :wink:

The symptoms you describe suggests that the service engineer has not refitted the boiler thermostat back into its pocket correctly. spraggo

The pump has to have it`s own dedicated permenant live via the pump over run switch on the boiler. spraggo.

So we both agree then. :wink: :wink:

Spot on LearnerSpark other than the OP needs to remove the link between 3 and 4 on the boiler block. spraggo

OK, to save any further confusion. The part that the white dial is attached to is known as the water section, Part No 011299, which obviously contains the, rubber diaphram which needs to be renewed. The cam with the spring and micro switch etc is known as the servo valve, Part No 012646...