Need help from an expert here please. Just lately my boiler has been performing strangely, the heating side of it works just fine ,but the hot water side lets us down badly .It used to give hot water if you reduced the flow while the central heating was on ,if no heating was on ,it runs warm for a few moments then runs cold again . The boiler appears to be running correctly , if you turn the hot tap on , the burner lights and stays on until you close the tap but the hot water doesn't come from the tap ,no idea if the water is actually sent up to the "water to heat" unit or not or whether something is broken and its leaking through somewhere else . When we experienced the hot water by using a decreased flow of water I just thought it was a perished/split diaphragm so bought a new kit to replace it ,when I stripped the diverter valve down ,it was badly perished but not split ,so that wasn't the problem so now I'm lost , hot water was misty when it first came out so somebody suggested cleaning the water to water heat exchanger ,that's been done and now runs crystal clear from the central heating side and the DHW side so that unit is clean and not blocked , the DHW sensor has been changed ,that didn't cure it .I started this renovation/clean up job last night and worked till about 2 in the morning ,at 7 this morning I started the rebuild ,popped out to get a few new fibre washers and I'm pretty well asleep on my feet now ,trying to strip down and rebuild while everybody else was asleep so as to cause no disruption to family life , I've replaced the diverter valve before and last time replaced the rubber diaphragm with a kit without problems ,now for the life of me I can't guarantee I've put the diverter valve back together properly or not (I'm tired and my brain is virtually asleep without me) at the moment , it doesn't seem to reach the micro switch when hot water is demanded ,and when the system gets re-pressurised ,the valve doesn't seem to stop, the pressure gauge goes up to max and the relief valve ejects the extra water, so there's a good chance I have put it back together wrong ,I'm sure I haven't and the logical method of working it out seems right ,but it's not working correctly so I must have made a boo boo somewhere .So if anybody changes these diaphragm regularly please let me know if I've rebuilt it in the correct order.it seems to fit together best that way but it doesn't want to work that way. So far I have gone to rebuild as from opened up valve
1. Opened up diverter valve fixed to main boiler
2. Diaphragm into open valve with large silver dish type washer and small spring assembly to the front .
3. Large spring onto this plate followed by front of valve casing.
4. Rebuild final pipework with water restricter inside
5.Turn water on and re-pressurise
This seems to fit together the best way but doesn't seem to work ,I just wish I wasn't so tired when I took it apart last night and remembered how it came apart. Maybe I am rebuilding it correctly and the actual diverter valve has gone/broken . Can't find any pics as to rebuilding the diverter valve and have nearly run out of fibre washers for today and still can't get it working correctly ,I've already changes the diverter valve once when the diaphragm kits weren't available ,and also previously renewed just the diaphragm kit when the old one perished ,obviously I wasn't quite so tired then and all went fine and without problems . This time I'm extremely tired and it's really bugging me .I think I've rebuilt it correctly but it's not working so something is wrong somewhere , was much better paying out for the new kit than £100 or so for a complete new valve . So if anybody can help, firstly with the valve rebuild ,then what the hot water failure might be, I'd be extremely greatful .
1. Opened up diverter valve fixed to main boiler
2. Diaphragm into open valve with large silver dish type washer and small spring assembly to the front .
3. Large spring onto this plate followed by front of valve casing.
4. Rebuild final pipework with water restricter inside
5.Turn water on and re-pressurise
This seems to fit together the best way but doesn't seem to work ,I just wish I wasn't so tired when I took it apart last night and remembered how it came apart. Maybe I am rebuilding it correctly and the actual diverter valve has gone/broken . Can't find any pics as to rebuilding the diverter valve and have nearly run out of fibre washers for today and still can't get it working correctly ,I've already changes the diverter valve once when the diaphragm kits weren't available ,and also previously renewed just the diaphragm kit when the old one perished ,obviously I wasn't quite so tired then and all went fine and without problems . This time I'm extremely tired and it's really bugging me .I think I've rebuilt it correctly but it's not working so something is wrong somewhere , was much better paying out for the new kit than £100 or so for a complete new valve . So if anybody can help, firstly with the valve rebuild ,then what the hot water failure might be, I'd be extremely greatful .