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My boiler pump fails to start/work when not used for several months?

I have a Potterton Profile boiler, with a Grundfos Super Selectric pump. If the Central Heating has not been used for some time (through the summer months for example), the pump fails to start/work when the Central Heating is turned on.
I normally get around the problem by firing up the central heating/pump (for a couple of minutes) every two or three weeks during the summer, which has stopped the problem from re-occuring. However, this year I forgot to do this and the pump is not performing once again.
I get the impression the pump "locks up" through a lack of use, so would be grateful if anyone can advise how to get the pump working once again?

Slide Rule
September 2008

Potterton Heating, Home Heating Systems Boiler Pump Months

I have a grundfos pump on an apollo heat exchanger residential heating system. The pump sometimes freezes because the system is not used for many months at a time. Probably because it is a tiny pump only 1/25 HP. There is no easy access hole to manually turn the pump as suggested in a previous answer but it is a relatively easy task to remove the pump by turning off the water and removing 4 bolts. then you can manually turn the pump with your fingers. Replace the pump, turn on the water.

Home mechanic
December 2008

Tom,

Much appreciate your reply and advise/suggestion. Pleased to report this worked and central heating now back in action. Thanks very much again.

Slide Rule
September 2008

i have a peglers pump which may be slightly different to yours but i have the same issue after a long summer lay off to rectify the issue i have to remove the screw plate in the centre of the pump then into the hole you can insert a screwdriver and when its seated you turn the screwdriver and this manually revolves the impeller give it a couple of turns and this will unfreeze the pump and it should work as normal

tom 2
September 2008