We have an indirect heating system fitted with the following:-
an Ideal Mexico gas boiler, a Honeywell V4044 diverter, a Grundfoss Super Selectric pump, and a Randal 103 electro-mechanical timer.
The water in the cylinder doesn't heat up however the boiler will fire up from cold and the pipework to the feed point on the cylinder is hot, but the return pipe is always cold! After around 5-10mins the boiler shuts off, presumably due to lack of circulation (??)
If I turn the cylinder thermostat down and the room thermostat up the radiators heat up as per normal.
The cylinder return pipe has an automatic vent which has been opened to vent any air and the pump & diverter recently changed to eliminate them.
No prior warning symptoms occurred prior to the fault and no work was done beforehand. Is it simply a case of a likely blockage in the return somewhere, just from the hot water cylinder or what? pipework is 3/4" I think.
Any advice is greatly appreciated.
an Ideal Mexico gas boiler, a Honeywell V4044 diverter, a Grundfoss Super Selectric pump, and a Randal 103 electro-mechanical timer.
The water in the cylinder doesn't heat up however the boiler will fire up from cold and the pipework to the feed point on the cylinder is hot, but the return pipe is always cold! After around 5-10mins the boiler shuts off, presumably due to lack of circulation (??)
If I turn the cylinder thermostat down and the room thermostat up the radiators heat up as per normal.
The cylinder return pipe has an automatic vent which has been opened to vent any air and the pump & diverter recently changed to eliminate them.
No prior warning symptoms occurred prior to the fault and no work was done beforehand. Is it simply a case of a likely blockage in the return somewhere, just from the hot water cylinder or what? pipework is 3/4" I think.
Any advice is greatly appreciated.