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

[Bobbymost]

Did you remove the actuator and turn the valve spindle manually to give CH only, pipe A hot, it doesn't matter what the actuator is calling for then, all we want to see is if the water then goes to CH only.

Yes i did that. Whatever position the Actuator is in or the valve only the Water Tank gets how.Heating isn't working no matter what i do

 

[Johntheo5]

Well, maybe try a new valve then or and try opening shutting the pump isol valves 4 or 5 times to try and get them to seat, failing that you will have to drain the system down to change the pump to see if that's the problem.

 

[dilalio]

Yes i did that. Whatever position the Actuator is in or the valve only the Water Tank gets how.Heating isn't working no matter what i do

Your diy skills are now exhausted mate.

 

[Bobbymost]

Did you remove the actuator and turn the valve spindle manually to give CH only, pipe A hot, it doesn't matter what the actuator is calling for then, all we want to see is if the water then goes to CH only.

yes i did Johntheo and it made no difference

 

[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.

The actuator is doing whatever it's called for CH or HW. But thats not making my radiators hot

 

[Johntheo5]

All I can suggest is you try to get the circ pump isol valves tight (opening&shutting them 4 or 5 times might do), failing that you will have to drain down the system, and install that other pump with two new isol valves, inspect the old pump impeller vanes & ports for sludge etc and take it from there, still no guarantee though that this will work since two rads are OK + the DHW heating.

 

[dilalio]

It's quite simple.
If the flow is open to CH and only 2 rads are getting warm/hot then either the pump is weak or the system is blocked.

 

[Bobbymost]

I fit a new pump. Drained the whole system and fired it back up. Still only have 3 rads working. Rest are all cold and there is no hot water near the valves. If i put it on CH the water tank heats up and 3 rads. If it's on HW same result. I have fit a new actuator, Pump and Thermostat nothing has changed.
Boiler fires up fine rads just don't get hot.

 

[Bobbymost]

It's quite simple.
If the flow is open to CH and only 2 rads are getting warm/hot then either the pump is weak or the system is blocked.

I fit a new pump. Drained the whole system and fired it back up. Still only have 3 rads working. Rest are all cold and there is no hot water near the valves. If i put it on CH the water tank heats up and 3 rads. If it's on HW same result. I have fit a new actuator, Pump and Thermostat nothing has changed.
Boiler fires up fine rads just don't get hot.

 

[Bobbymost]

All I can suggest is you try to get the circ pump isol valves tight (opening&shutting them 4 or 5 times might do), failing that you will have to drain down the system, and install that other pump with two new isol valves, inspect the old pump impeller vanes & ports for sludge etc and take it from there, still no guarantee though that this will work since two rads are OK + the DHW heating.

I fit a new pump. Drained the whole system and fired it back up. Still only have 3 rads working. Rest are all cold and there is no hot water near the valves. If i put it on CH the water tank heats up and 3 rads. If it's on HW same result. I have fit a new actuator, Pump and Thermostat nothing has changed.
Boiler fires up fine rads just don't get hot.

The old pump was full of sludge by the way

 

[terryplumb]

You have a blockage in the pipework.

 

[Agile]

Sounds like time to desludge.

Add X400 via the header tank and bleed out a couple of litres from a rad to get some into the system.

Run the system on heating only and mostly turn off the rads which are working to encourage flow into the blocked ones.

X400 can be left in a system for up to four weeks if necessary. But then needs to be drained out and the system flushed out a couple of times.

If your system is in good condition you could use citric acid as that can dissolve the sludge but needs to be used sparingly as otherwise it can cause some rads to pinhole and leak.

 

[dilalio]

The old pump was full of sludge by the way

Which means the whole system is.
Draining and refilling the system is not the same as flushing/cleaning it.