Potterton Netaheat Electronic - No CH but HW available

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23 Jan 2011
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Location
Middlesex
Country
United Kingdom
Dear All,

We have an old Potterton Netaheat Electronic 10-16. The boiler is wired through a Randall 3060 timer and a mechanical thermostat.
We have hot water when the timer is set to hot water or set to Central heating/ Hot water options. But no Central Heating (non of the radiators getting heated or pipes getting heated) when set to Central Heating options (H on/ W on, H Once/W Once, H Twice / W Twice etc.) . Boiler fires up without any problems.

Tried setting the thermostats (mechanical thermostat and the thermostat in the boiler) to full but still no central heating. Also tested the mechanical thermostat and it is fine. No electrical immersion heaters connected to the hot water tank. One issue though, we have not flushed the system for a quite long time. We did not have any issues with this boiler for a long time and therfore do not want to replace it.

Please advise us on the possible problems.
Many thanks
 
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Not clear to me what type of system you have!
Some systems are basic and rely on a circulating pump controlled by a room stat. Problem could be wiring, room stat or pump.
Fully pumped systems use either a 3port mid position valve or two 2port valves, one of which is for heating.
Problem could be wiring, room stat or the head of the valve motor or micro switches within. (pump will be ok if HW working)
 

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