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Hello Harry, I would agree it points to the 3-port valve, replacing this will have to be the next step. Even if this is not the problem, it would eliminate it as the problem. Unfortunately as my luck would have it, my valve is drain the system replacement, this been the case I will have to put...

Hello Harry, thank you for your reply. I have looked for actuator micro-switches on the boiler, can't see anything like that. But a significant development, after reassembling the 3-port valve assembly, I set the lever on the vale to manual (slid it over and locked it into the notch). After...

As I said in my last E-mail I have removed the 3-Port motor, then activated the micro switches in both closed and open positions, this did not operate the pump. which suggests, together with my multi meter testing of the switches this is not the problem. I have been doing further research on the...

Thanks for everyone's help. I tested the 3-port valve micro switch, it all checked out, resistor values,diode and micro switch operation. But just to make sure I changed the micro switch assembly. Unfortunately this did not solve the problem, radiators heated to Luke warm then the pump switch...

As you will Know, to clear an airlock/blockage the boiler thermostat is removed, the excessive temperature of the water clears the blockage. Do you think this could be the case. My house has a micro bore system, unfortunately the plumber who installed the system was not to bothered about nice...

Thank you Harry. As someone who has a limited knowledge of heating systems I very much appreciate you advice. I did not realise the micro switches did more than limit the motor travel. But after your explanation, it makes sense, if you switch to H/W only you don't need the pump running. Can I...

Thank you guys for the suggestions. I will try removing the 3 port valve micro switch assembly, but I can't see the micro switches been temperature sensitive, they have no means of detecting temperature, I think they just control the limit of the valve rotation, stopping the valve motor at the...

Thank you for your quick reply. There are no motorised Valves, just a Honeywell 3 port diverter valve. The thermostat is working, I can stop and start the boiler by rotating the temperature setting on the control.

Hi I have a old Thorn Olympic 38/50B boiler which only gets my radiators warm. It would appear that the pump stops when the radiators are look warm, even if I set the boiler thermostat to max and the room thermostat to max. When I operated the pump directly from a separate 240 volt supply the...