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Most likely the how water thermistor is faulty, but it could be a scaled up heat exchanger. Is the water very hot just before it cuts out. Can you see if the flame reduces to a low flame as the water gets hotter? If you have a multimeter you can test the resistance of the thermistor. Let me if...

Sterose is right about the expansion vessel. It'll be a big red or orange vessel on the boiler, look at the exploded diagram in your manual if you have one. I would recommend getting a heating engineer to check it as this is a safety component and there is a particular method for topping up the...

BG charge £87 call out + £16 per 15mins thereafter. You're looking at 1/2 hour per rad depending on the state of the system, but BG only have two prices; up to 11 rads and 11 rads+. BG also replace the pump and, AFAIK, cover any rads that leak as long as you're on 3* maintenance cover. Included...

You may be better off getting a heating engineer rather than a CORGI plumber, they should have more experience with this sort of appliance. Saying this, the plumber may be right. I've come across this fault before where a relay has failed on the PCB, but only when CH is on. There are some...

Pilot may need cleaning, adjusting or be too small - Corgi eng job. Otherwise, take a look at the gas meter when you turn it on and see if the dial turns briefly when you turn the boiler stat up. If the pilot is going out when the gas valve opens you may have a faulty meter governor - this is a...

I have one on my van :-) New will cost about £130 +VAT, so you may want to search for a reconditioned one. The part no is 5102160 for new or 40775099 for reconditioned. Try a search on google or look for boiler spares in yellow pages. Just found www.cetltd.com, which has reconditioned ones for...

As masona mentioned, it could be TRVs sticking if you have them. But the first thing I would look at is the pump, you may have enough gravity circulation to heat upstairs but the pump is failing to get the heat back downstairs.

Try this: turn on 'heating only' at the timer (if possible); shut all other rads bar just one of the faulty ones; make sure both rad valves on the faulty rad are fully open; turn the pump to max speed if not already; close the bypass if you have one and you know what it is; do the same...

'Most likely' the diaphragm is worn, part# 32664 GC# 366256. If you can increase the speed on the pump then try this to see if the boiler works. If so then the chances are it's a worn diaphragm or pump. The other option is that you have a sealed system if you live in a flat. Do you have...

In case you don't know, there will be a hose, usually chrome just below or near the boiler. On one end of this is a non-return valve, the other end there will be a tap of some sort. The tap may have a handle a bit like a washing machine tap, or a flat bladed screwdriver slot. Turn this tap so it...

It's a Gland Seal Assembly. They are available from the Danfoss website: Danfoss Randall Ltd Ampthill Rd Bedford Bedfordshire MK42 9ER Tel: 01234 364621 http://www.danfoss-randall.co.uk Follow the TRVs link, then search for 'Gland Seal'. On the page that follows click...

It does sound like the pump. If you can't get a voltage tester as breezer suggests take the 3 wires out and wire them up to a 240v appliance such as a bedside lamp, hairdryer or something to see if you have power. What type of pump is it, make and model if possible? You'll usually find they're...

If you have the correct sized gas supply pipe i.e. 22mm pipe and transco have eliminated the meter governor then the boiler is faulty. These boilers ignite at 10mb. The burner is fully modulating and the pressure is controlled by the speed of the fan. Explosive ignition is dangerous so Ideal...

Did everything get hot - radiators and hot water. If not then it sounds like your pump is either not spinning or the impeller is detached. There should be a screw or nut on the front of the pump which you can undo to manually rotate the pump shaft. Paul

Does the spark stop when the pilot is lit or can you still hear the spark. If you still have a spark then you are not getting flame rectification at the pilot, in which case either the pilot is partially blocked or you need a new pcb. If the spark stops then the gas valve solenoid GV2 (the high...

Just make sure they've finished playing before you squirt on the lighter fuel :)

I assume your boiler is a baxi 551, 552 or 401 and not one of the newer types. As breezer says, it will most likely be the thermocouple. I would say you have an 85% chance of it being the thermocouple, 10% chance of it being a restriction to the pilot and a 5% chance of it being the gas valve...

Thanks for the advice! Cheers, Paul

A new system has a lot of air in the water. This can be released through the auto air vent in the boiler and bled through the rads. Either of these will cause the pressure to job and is normal. The other thing that happends with new systems is glavanic action or electolytic corrosion caused by...

It could be one of a number of things. What model is it? The most common are Prima, Netaheat, Profile or Suprima. Does the flow pipe from the boiler get very hot? Do you have a fully pumped system i.e. can you run the heating on its own without a hot water demand?