Hi, I have a Vaillant 831 combi. Earlier today I installed some new taps in the downstairs loo, there were no isolating values so I had turn off the stopcock and drain both hot and cold feeds down. Taps fitted and everything's good.
However, we now have no hot water. The Vaillant is running CH fine (just as well in this weather!) but does not detect the demand for HW. No error message is displayed, nothing seems to indicate there is a problem.
I have discovered that I can get permanent luke warm water by enabling the Warmstart feature. Presumably the combi is failing to detect demand and just ticking over due to Warmstart.
I've tried resetting the boiler but no change.
Any advice as to what this could be please?
I'm unclear as to whether draining the system may have caused this problem, but I've flushed all air out of the system now.
However, we now have no hot water. The Vaillant is running CH fine (just as well in this weather!) but does not detect the demand for HW. No error message is displayed, nothing seems to indicate there is a problem.
I have discovered that I can get permanent luke warm water by enabling the Warmstart feature. Presumably the combi is failing to detect demand and just ticking over due to Warmstart.
I've tried resetting the boiler but no change.
Any advice as to what this could be please?
I'm unclear as to whether draining the system may have caused this problem, but I've flushed all air out of the system now.