hi all,
I have a Baxi 80He boiler. Rads we're working fine but no Hot water.
Have checked that the flow sensors were working, pump was clearly working, system pressure correct, boiler firing as expected and temp sensors indicating rise in water temp on the front display.
I noticed in hot water mode that the boiler feed and return pipes were baking hot. The motorised actuator on the diverted valve is operating and the water flows through the how water pipes around the boiler. (I checked by touching and checking the in/out flow pipes going to the expansion vessel at the back of the boiler) However the heat exchange plates remained cold whilst bypass pipe got very hot. Rads are not heating up when hot water is demanded so this all indicates to me that the main diverter valve is operating as expected.
I have taken off the plate heat exchange and it's not clogged. I have removed the front diaphragm on the pressure differential value unit and it is working and freely moving however I have now seen that the pin in the main body of the differential valve assembly appears to be stuck in?
Having done all the other checks this would appear to confirm that water was only being diverted into bypass and back round the boiler.
Is the assembly something that can be refurbished or should I be buying a new unit? It's a real pain to get out as I can't quite get in to undo the bypass pipe feed, so before I take it any further and buy a fairly expensive unit I wanted to check if anyone had other thoughts!
Thanks for any advice/thoughts!
I have a Baxi 80He boiler. Rads we're working fine but no Hot water.
Have checked that the flow sensors were working, pump was clearly working, system pressure correct, boiler firing as expected and temp sensors indicating rise in water temp on the front display.
I noticed in hot water mode that the boiler feed and return pipes were baking hot. The motorised actuator on the diverted valve is operating and the water flows through the how water pipes around the boiler. (I checked by touching and checking the in/out flow pipes going to the expansion vessel at the back of the boiler) However the heat exchange plates remained cold whilst bypass pipe got very hot. Rads are not heating up when hot water is demanded so this all indicates to me that the main diverter valve is operating as expected.
I have taken off the plate heat exchange and it's not clogged. I have removed the front diaphragm on the pressure differential value unit and it is working and freely moving however I have now seen that the pin in the main body of the differential valve assembly appears to be stuck in?
Having done all the other checks this would appear to confirm that water was only being diverted into bypass and back round the boiler.
Is the assembly something that can be refurbished or should I be buying a new unit? It's a real pain to get out as I can't quite get in to undo the bypass pipe feed, so before I take it any further and buy a fairly expensive unit I wanted to check if anyone had other thoughts!
Thanks for any advice/thoughts!