Boiler working, Pump Working, Actuator working but No Heat or Water. Can anyone help?

[Johntheo5]

Are you really sure that the MPV is going over to CH only which will ensure that all the circulation is just through the rads, if you are, then you can really start trouble shooting, might be worth doing those tests I suggested in post #36, even though a PITA.

 

[dilalio]

..

 

[Bobbymost]

Are you really sure that the MPV is going over to CH only which will ensure that all the circulation is just through the rads, if you are, then you can really start trouble shooting, might be worth doing those tests I suggested in post #36, even though a PITA.

Hi Johnatheo sorry im not being rude bit i have no idea what that statement means? MPV? PITA?

 

[Bobbymost]

Its quite possible, its a ingenious but devilishly cunning device, thats why you should try all the various combinations, so suggest when its apparently in mid position, HW&CH calling, pull on that manual lever, if it is in mid position then the lever will be loose and floppy with no resistance as soon as you pull on it, if so, do 2 more tests, one, I mentioned above, "with both HW&CH selected just turn the cylinder stat right down, the valve should go fully to CH only and the boiler should remain firing, see below, also check pump on speed3." HW, Port/pipe B should then get cool after a while and the boiler should continue to fire for at least a few minutes even if only 2 rads, for whatever reason, are only heating. If the boiler doesn't continue (see below) to fire, put both HW&CH back on and simply switch off the HW at the programmer and see what happens.
Also remember that any time the valve changes position (even when working perfectly), the boiler will stop and then refire within, at the most. 10 secs or so.

Sorry but i think i missed this reply

 

[Johntheo5]

Hi Johnatheo sorry im not being rude bit i have no idea what that statement means? MPV? PITA?

MPV is a (the) Mid Position Valve, the three port valve that you have.
PITA is a more polite way of saying a "pain in the a--"

 

[Bobbymost]

Are you really sure that the MPV is going over to CH only which will ensure that all the circulation is just through the rads, if you are, then you can really start trouble shooting, might be worth doing those tests I suggested in post #36, even though a PITA.

MPV? Do you mean the Actuator?

 

[Johntheo5]

Yes, the MPV or 3 port Mid Position Valve consists of a actuator and a valve.