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Hi Peeps, I have a fault developing on the above boiler and have had expert advise from this forum in the past, hopefully someone can help me again. The boiler DHW is playing up, (CH is fine though). We have noticed the hot tap (but ONLY on the Bath, which is a mixer/shower tap with wide...

Central heating is working fine, but now no hot water at all. Last week the hot water temp was up and down, but now I can't even here the boiler firing up on demand. Any ideas? Dawson

Hi, I have a viessmann vitodens 100 condensing combi boiler. It has been fine until now. The water temp. when in the shower fluctuates, warm, then cold then back warm again. It repeats this until shower is turned off. I have metered the boiler temp sensor, and according to the book at 50 degrees...