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Can a central heating pump be too big for the system and what are the consequences? Our system was fitted with a Grundfos 15-60 130 cat no. 1/44/215 which replaced a Terrier TC6 TF110 IP44 Class H . The engineer said it was a bigger pump and we had to turn it down to level 1 as it was pumping...

Tried turning the cylinder stat down to zero. Left heating on low all night and my husband (who is now waking at 6 when the heating/water come on) says there was no pumping over. Could it be a sticky motorised valve?

I've added a pic of the old pump, which the engineer said was too steep.

The bypass was done in Sept 2004 (yes we still have one with the required length loop). This change has only been since we had this new pump in Dec 09. The heating system was perfectly OK til we had the new pump, with just the occassionally air letting required from one radiator. How...

The bypass was moved and replaced as per boiler installation instructions, The system was updated in 2004/5, with new Micron 70 boiler, new pump and valves plus new rads. It was thoroughly flushed and Fernoxed between installation in June and November of the year of installation. Yes we have...

I'm sorry as I don't know where the spindle is, but I have added a photo of the old pump, as it doesn't seem to look the same to me. http://www.diynot.com/network/WillsNana/albums/ Also, should the pump electrics lie under the pump?. And the new pump is a Grundfos 15-60 130 cat no...

Underfloor pipework was changed slightly but using same pump which expired early Dec 2009

Bumping this up... We had the ch only , on all last night. When the timer kicked in in the morning and the HW came on too, it was pumping over within about 5 mins. Motorised valve do you think?

Well a few weeks down the line and my husband has been woken by hot water going up the overflow pipe, switched the heating off then started it again. and then it's been OK, but I'm now noticing that the overflow pipe is getting hot again when the timer switches on in the morning and in the afternoon

Away from the boiler - Yes Not getting hot at all in vent pipe now it's on number 1. The rads are still getting hot. Old pump was set to 2 but vent pipe would heat up halfway. Will get the husband to check the tank is refilling and water not low. Systems fitter said this new pump is...

I've added a bigger picture, I don't know where the arrow is I'm afraid. I wondered is why the pump is on it's side. Is that OK?

Pump installed December 2009

Should the pump be fitted like this? The system engineer left us with the pump running on 3, then the water started bubbling in the overflow /refill tank. Not sure how include images with my post but this is how the pump looks...looking down into underfloor...

Not sure how include images with my post but this is how the pump looks...looking into the floor http://www.diynot.com/network/WillsNana/albums/ I'm sure that the old one had the circular bit facing upwards, as you have to put your hand underneath to get at the three levels (1,2,3), so is...

Pump installed December 2009

Pump installed December 2009

central heating pump

They have been and installed the pump, but I notice the water pipe to the overflow seems hot. If the pump had been installed the wrong way round, would it cause the pipe to do that or has the cold just raddled my mind? Or could it be air in the system getting out?

No they may come back today, or it may be tomorrow :?

You were right SS. It's the pump.