Hello
Posted another thread about annoying noises from hot water system. Think I've now narrowed it down to expansion. And repeated expansion as boiler short cycles, pipes cool, reheat, expand, repeat.
Vaillant 418 boiler. Working fine on CH request, previously throwing S.53 states but is not running d. 0 at 10 rather than originally 18.
With not water only requested, boiler fires and runs OK for around 20 minutes. After this, it goes into short cycling, fires for about 20 seconds, reading on front of boiler reaches 75 or 80 C and then it shuts off for around 2 minutes and then just repeats the cycle until time request expires.
If running both hot water and heating together, system seems OK. Hot water isn't reaching tank thermostat temperature, request for heat is constant.
Anything I can start to look at to diagnose this please?
Posted another thread about annoying noises from hot water system. Think I've now narrowed it down to expansion. And repeated expansion as boiler short cycles, pipes cool, reheat, expand, repeat.
Vaillant 418 boiler. Working fine on CH request, previously throwing S.53 states but is not running d. 0 at 10 rather than originally 18.
With not water only requested, boiler fires and runs OK for around 20 minutes. After this, it goes into short cycling, fires for about 20 seconds, reading on front of boiler reaches 75 or 80 C and then it shuts off for around 2 minutes and then just repeats the cycle until time request expires.
If running both hot water and heating together, system seems OK. Hot water isn't reaching tank thermostat temperature, request for heat is constant.
Anything I can start to look at to diagnose this please?