No it isn't, and so what anyway?Agile said:That would have been covered by my para 3 of 3 March 6.47pm.
emailpatch said:----Just let me clarify, even in just HW mode on the front of the boiler the problem still occurs, for some reason the feed to the motor actuator changes from brown to black ect and sends the heated water down the CH when only the hot tap is on and no central heating.
Chris has only quoted what the boiler should do! Not why it may not be working corectly!
Me said:A dirty signal from the flow switch could make the boiler switch between CH and HW.
ChrisR said:I also suggest you measure the 0V and 5V with a voltmeter as described. If you use a resistance meter you only see what is being presented when you happen to be looking, and with whatever source the meter happens to be using, which can vary enormously.
...over a curry. About bXXdy time for another one, by the way, Tony!
Agile said:I am waiting for both the resistance readings on the switch with the wires removed.
When you measure these resistances, its important to measure the closed resistance on a low ohms range and get the real resistance reading. Put the test leads together to see what the lead resistance measures.
Also you must measure the open circuit resistance on a high ohms range to ensure its over 1 Meg when open circuit.
The temperature display is not the exact water temperature its the system water temperature. Its based on a temperature sensor reading.
Did you ever measure or change the temperature NTC sensors? It could be one is intermittent!!! May be easier to change the DHW one in case!
Tony
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