Question about Grundfos Pumps Grundfos 52722518 Brute Three Speed Bronze 1/6 Horsepower Recirculator Pump

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Grundfos circ pump on e-classic central boiler is running but overheating. Any ideas ?

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  • Scott Crockatt
    Scott Crockatt Oct 13, 2013

    when it overheats it shuts off.



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Are the valves fully open both sides of it? is there a blockage in the pipework? perhaps needs flushing out...

Posted on Apr 09, 2014


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Niagara delta 30ff combi boiler, 13 years old. problem when the hot water for bath heats, the radiators in the house also starts heating, even after central heating thermostat is switched off.

sounds if your zone valve isn't closing off and the circ pump runs all the time ?? ck to see if zone valve gets power all the time or only when thermostat calls for it , if power is only there when called for then your valve is bad (common)

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Taco 007 circulating pump stays on even though boiler shuts down

Don't know your specific unit, but in general, heating systems are two-stage devices:

1: Its too cold: the motorised HW/CH valve moved to the required position, and on achieving it, the circulaion pump starts and the boiler is enabled. (The circ pump may start immediately - its not usually important.) The hot water from the boiler circulates through the heat exchanger and/or radiators until the thermostat thinks its target is warm enough, whereupon it disables the boiler, stops the pump and closes/relaxes the valve(s).

2: The boiler is off while disabled. When enabled, it heats the circulating water to a 'high' temperature and seeks to keep it there. If it reaches that temperature, the boiler will cycle on and off as necessary to maintain the set 'high' temperature. (The circulation pump must run all the time the boiler is enabled.) This may be what you're noticing. Additionally, some boilers will run the circulation pump for a little while after being disabled to reduce the temperature if the water in the pipes and boiler.

Your question doesn't say how the pump running corresponds to thee thermostat settings, but if it were stuck on, I think you'd know!

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New pump? Or old? Previously used pumps sometimes get stuck. They do not have a lot of starting power and very little debris or rust can keep it from running. Remove the 4 Allen head bolts from the motor to volute. Spin impeller by hand. Should have no resistance. If that's good reinstall and try again. If you have verified power to the pump and it is still not working get a new pump.

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I have a submersible deep well pump and lately if I run the water for 15 minutes straight it shuts off why.

Grundfos pumps are thermally protected by a bi-metal strip temperature switch. Your pump is overheating. Typical cause of this is operating to near the shutoff head pressure. Try reducing the discharge pressure by increasing the flow rate.

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Hello anon, this sounds like there is a problem on the electric side of your boiler. Depending on the boiler if its a combi type it is one of the pcb's calling for the pump to run. If at all possible call a specialist who deals with Central Heating and dont try and fix it yourself.

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If you can not hold your hand on the motor for a count of 10 when it has cut out, the motor has overheated and needs to be replaced or find some reason for an overload.

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Grundfos installation with Buderus boiler. Pump which is assigned to hot water throughout house, seems to be working (noise and vibration indicate that) but hot water doesn't pass the valve. Pipe below...

Do you have more than one zone? If so, it is difficult to tell if the circulator in question is actually running. A trick is to get a screwdriver and place the metal end on the front of the circ and the other on your ear. You will hear it if it is running. If you do hear it, is the circulator itself very hot to the touch? If it is, it may be burnt out, or the zone needs to be bled of air. Another doubtful, but possible, answer is that the circulator is installed backwards. There is an arrow on it and it should be aimed towards the flow of water.

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