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Most likely the pcb common fault on Profile and Prima boilers.

The plate heat exchanger is probably blocked it is quite common on these boilers.

Hi the two blue knobs both have to be turned on, if you can only turn one slightly it is probably sticking turn it slightly harder.

These traps are also known as Anti-vac traps.

Hi connect the wires which went to D to a connector block, not to any connections of new programmer. Connection 5 on old programmer usually had a link to connection L, so if you had any wires connected to 5 and a link to L then connect them to L, if you had wires connected to 5 but no link to...

No as long as you don't use a pump you won't lose the airlock.

Hi i don't know how your pipes are laid out but if you could feed your kitchen tap from upstairs pipework and then return to side of cylinder from downstairs without the pipework dropping below the connection level to the cylinder you would be able to get gravity circulation without the need for...

Open vented hot water system should be piped this way. Cold feed to the hot water cylinder enters the bottom of the cylinder, hot water comes off the top of the cylinder which is also the open vent. Boiler flow and returns enter cylinder at the side through a coil, this water is seperate...

Hi when you say you have a hot water loop, what exactly do you mean?. Do you have a conventional gravity hot water system ie open vented cylinder?. Where is the return entering the cylinder?. Is the pump fitted as a secondary return aid to stop a long dead leg?.

How about Biasi boilers there cheap and reliable IMHO.

2)blue switchmaster av1 midi valve actuator, is the obsolete part Should have read more carefully.

Have a look at FAQs 3 & 32. If your existing Honeywell mid position valve has a dimple on the lid it would better to replace just the actuator than drain down system with all the problems you could get.

1) Why have you used a plumber who can't do the job?. 2) Why has he fitted an obsolete part?.

On the top of the pump is the auto air vent, make sure the little black cap is loose, somewhere on your system usually close to boiler you will have a filling loop, silver braided flexible pipe across to pipes. Look in faqs if you are not sure what one looks like.

You could try shutting valves on your other circuit, so that water is forced to go through your underfloor heating.

Sounds like air in system.

Remeha Advanta boiler boilers are good, small in size and have lots of options for you to control your enviroment.

Hi if your boiler is a 10/16 mk2f then it is still possible to get a gas valve, if it is the later 10/16 electronic model the gas valve is discontinued but all other parts are still available. The electronic models gas valve will click twice the first one lighting pilot the second one...

No real reason just that you said that the hot water was fine, but it could quite easily be either valve.

No if you have one valve for heating controlled via your room stat and one valve for hot water controlled via a cylinder stat, they should both close when power removed by turning off programmer. If they are spring return valves you should see them close, the lever moves and you can feal...