I have a Potterton gas fired boiler which on a CH only setting on the programmer starts up but then cuts out before any water can be pumped elsewhere. However, with both HW and CH on it works fine. When only CH is on the pipe coming out and upwards from the boiler (downstairs) gets very hot and the boiler cuts out before any radiators get hot. However, with both HW+CH on the water gets split between heating and hot water due to mid-point valve to the extent that the water takes ages to heat up. If I turn off a few of the radiators the remaining 3 radiators get hot and the water gets hot as quickly as I would expect. Is there a reason why the system only seems to be able to cope with half of the radiators on?
CH only works with HW
- Thread starter Aviboy
- Start date
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This looks like yet another 3 port mid position valve problem.
It works ok on HW only or HW shared with CH but not CH only.
The valve is not reaching the final position due to a faulty motor or if it is reaching the final position it is not supplying power to the boiler/pump via the orange wire due to faulty microswitch.
Suggest you do a search, it's been covered many times.
It works ok on HW only or HW shared with CH but not CH only.
The valve is not reaching the final position due to a faulty motor or if it is reaching the final position it is not supplying power to the boiler/pump via the orange wire due to faulty microswitch.
Suggest you do a search, it's been covered many times.
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