Help...hot water but no central heating

[truffers]

I have a Gas Baxi Bermuda 552 combi, a Grundfos Selectric pump and a hoeywell ST699B programmer, for the last 3 days i have had no central heating, but have hot water. I have bled the rads, no air locks, i can feel the pump vibrating, the programmer is set to continuouse on both hw and ch, (Which i have pa=layed with but made no difference) boiler on which usually makes a few bangs when starting, but have had no bangs for the last 3 days? What could the problem be? Any help would be great, many thanks.

 

[truffers]

that is supposed to be 'played with' not 'pa=layed with'

 

[ollski]

motorised valve most likely. Tell us what sort of valve(s) you have on the system.

 

[kevplumb]

see this

 

[chrishutt]

the Baxi Bermuda is not a combi boiler. It is a back boiler, supplying heating and hot water via a diverter valve (if fully pumped). The problem could be that the diverter (3 port) valve is not opening to the heating circuit.

 

[ChrisR]

Like oilski said, we don't know what valve(s) he has yet.........

 

[truffers]

Sorry guys, its a 3 port 3 position motorised valve

 

[traineegasman]

May not be the valve, may just be the motor that drives the valve, is there a `click` sound coming from it? You can test the valve by taking the motor off, after isolating the electrics of course, ( fused spur)? See if the top of the valve will move freely, use pair of grips, if it does, it`s probably the motor that drives the valve that is cream crackered. If it won`t move freely it`s probably seized. You can probably free it & use a bit of WD40, to keep it lubed up, may go again in the future but worth doing & saving yourself a few bob if you have to call me out If you do take the motor off, note the position of the spindle on the valve, & the position of the `d` shape underneath the motor

 

[traineegasman]

Then again it may be your roomstat, or your programmer if it`s not your motor/valve post back & we`ll go through the process of how to test the above

 

[kevplumb]

motor is favorite

 

[gazthepottertonengineer]

sounds more like cylinder stat to me or maybe air lock in coil on cylinder but hey what do know i only work for Baxi ??

 

[kevplumb]

oh yeah and the rest position for a three port sprung valve is



hot water

 

[gazthepottertonengineer]

sorry i misread i will shut up now

 

[kevplumb]

no probs mate we have all done it at some time or other

 

[traineegasman]

but hey what do know i only work for Baxi ??

Sorry just found this little gem...yes you ONLY work for Baxi...next time you make a visit, let the forum know in advance... We`ll put banners up informing the rest of the engineers that `Gaz` is coming..maybe some of us will have the opportunity of kissing the hem of your gown...