D
Dotty
For hints, tips and secrets of boiler breakdowns.
Discuss Boiler Breakdown Sticky in the Plumbing Jobs | The Job-board area at PlumbersForums.net
Vaillant f75! Why bother we all no this one lol
What's that then? Don't work on valiants much.
Sorry missed that vaillant water pressure switches detect system pressure but also look for a 0.3 bar spike when the pump first kicks in, if it doesn't detect the spike thinks its a pump failure. So if the pumps running but getting f75 it's a blocked up pressure sensor. Bad position on the old models bottom left now top left on the new models.What's that then? Don't work on valiants much.
Sorry missed that vaillant water pressure switches detect system pressure but also look for a 0.3 bar spike when the pump first kicks in, if it doesn't detect the spike thinks its a pump failure. So if the pumps running but getting f75 it's a blocked up pressure sensor. Bad position on the old models bottom left now top left on the new models.
Changing one of these on Monday. Vaillant also say there is a filter that can be accessed and cleaned if you remove the rubber flow hose.
Glowworm ci. flexi hose to expansion vessel becomes kinked/blocked. Can usually fixed by giving a gentle squeeze with grips. PITA to replace.
Vaillant also say there is a filter that can be accessed and cleaned if you remove the rubber flow hose./QUOTE]The filter is is plastic and i have found it very hard to remove to clean. You are better of chucking the whole piece in a bucket of descaler.
Sorry missed that vaillant water pressure switches detect system pressure but also look for a 0.3 bar spike when the pump first kicks in, if it doesn't detect the spike thinks its a pump failure. So if the pumps running but getting f75 it's a blocked up pressure sensor. Bad position on the old models bottom left now top left on the new models.
Not really a fault as such but if you get asked to service a powermax (the older version 155 i think) take the burner gaskets with you and take the burner out. 9 times out of 10 the baffels in the heat exchanger have fallen to bits. They are about £17 each and there are 8 of them. (read in manuall you are suposed to replace the baffels every 2 years!) To remove once cracked you have to remove the sump and its a good few hours. Boiler classed as ID. The last 3 powermax boilers I have serviced have all resulted in winning new boiler changes.
Reply to Boiler Breakdown Sticky in the Plumbing Jobs | The Job-board area at PlumbersForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.