Apologies if this issue has been posed before, although I could not find it in the first 20 threads.
Simply, I have noticed my domestic hot water heats up when my central heating is turned on, this, despite hot water not being selected on the boilers inbuilt programmer?
The boiler incidentally is a 15 year old, oil fired Worecester Danesmoor 20/25. Its a conventional 'old type boiler' (not condensing) and this issue aside, it works very well.
If I select hot water via the boilers in-built programmer the water becomes very hot as opposed to the very much reduced temperature I get when only the central heating has been selected.
I suspect the hot water tank is being topped up by my running the central heating though question why it would do this? This leads me to my question which is; Is it normal for my hot water be warmed (albeit slightly) by having the central heating on, and if not, does this indicate something is going on in the background which should not be doing so.
To give you some idea to what extent the domestic hot water is being heated, it is certainly warm enough to wash in comfortably.
About two weeks ago following a powergrid loss - when electricity was restored some 15hrs later, I noticed the boilers programmer lcd has disappeared. I traced that fault to a spent battery on the back of the pcb which I replaced. Whether that has impacted on something I'm unsure, though this issue with the domestic hot water seems to have begun around the same time?
Reading previous invaluable advice on the forum had me wondering if the C/H systems 3 port diverter may be suspect?
Any pointers or thoughts with this issue would be very much appreciated.
Thanks in advance
Simply, I have noticed my domestic hot water heats up when my central heating is turned on, this, despite hot water not being selected on the boilers inbuilt programmer?
The boiler incidentally is a 15 year old, oil fired Worecester Danesmoor 20/25. Its a conventional 'old type boiler' (not condensing) and this issue aside, it works very well.
If I select hot water via the boilers in-built programmer the water becomes very hot as opposed to the very much reduced temperature I get when only the central heating has been selected.
I suspect the hot water tank is being topped up by my running the central heating though question why it would do this? This leads me to my question which is; Is it normal for my hot water be warmed (albeit slightly) by having the central heating on, and if not, does this indicate something is going on in the background which should not be doing so.
To give you some idea to what extent the domestic hot water is being heated, it is certainly warm enough to wash in comfortably.
About two weeks ago following a powergrid loss - when electricity was restored some 15hrs later, I noticed the boilers programmer lcd has disappeared. I traced that fault to a spent battery on the back of the pcb which I replaced. Whether that has impacted on something I'm unsure, though this issue with the domestic hot water seems to have begun around the same time?
Reading previous invaluable advice on the forum had me wondering if the C/H systems 3 port diverter may be suspect?
Any pointers or thoughts with this issue would be very much appreciated.
Thanks in advance
Last edited: