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My findings so far. Isolated hot inflow. Pumped hunted so i opened it again so it doesnt run dry and damage pump. Next I closed mains and opened kitchen tap til steady trickle. Closed pump hot and cold outlet. Trickle stopped immediately. Then I opened them again but trickle did not...

Hi Tony. I did the tests you asked for and gave results in an earlier post. Let me know if you have a test which will identify this as the cause. I'm really keen to get this problem sorted out and so even if we suspect it is the mixers causing the problem I still need a professional to verify...

Hi I was out last night so was unable to do the test. though I shall do this test tonight. Though last night when I came home and I turned on the mixer tap on the first floor (pumped hot and cold mains fed) with the mixer all the way over to the cold side, for a few seconds when I opened...

Do you mean close the valves on the pump hot and cold outlets? Thanks

Morning all I was able to turn the mains off at the valve in the street as well as in the house (turned off around 7pm). I did this and didnt use any water until about 10pm. The hunting did not stop as after I had finished watching a film I heard the pump. Because I was watching a film...

Yes. Its all new. Even the pipe leading from the mains on the street coming into the house was replaced. I will turn the stopcock off in the street first and test for the same result with the kitchen tap. If I have to go putting in any valves then thats probably beyond me!

I shut it finger tight, but firm enough for it to be properly closed. I was going to look out on the street for the stopcock at my water meter and try that one too.

Not hard. So do you want me to turn off the mains and leave everything else as is? (pump on (neither hot nor cold isolated), mixers in normal position and kitchen tap closed?) I can do this before I go to work tomorrow. What do I check when I get home. Just whether the hunting has...

It definitely isnt a toilet as this is a hot side problem. The pump's hunting is caused by the hot side. I spoke to Grohe (shower mixer) and their technical support think the problem is supplying some parts of the house with mains cold and some parts with pumped cold but always in conjunction...

Thanks tryitandsee. Called ST. They said that if the hot outlet is isolated is turned off and the hunting stops then it is definitely not the pump. It is caused by a drop in pressure on the hot causing the pump to cycle. The pressure has to drop to one bar for the pump to cycle therefore since...

Tony asked me to put them all in the cold position before but I figured the cold position was as good as any other anyway. Yes, pump continues whilst mains is off and kitchen tap is open. Obviously when I close the hot outlet from the pump the hunting stops. ??? :?

Morning Tony Right....As you asked I turned off the mains at the cellar stopcock and kitchen cold on, all mixers to cold position. The flow rate of the trickle from the kitchen tap was 0.1375L/min Two hours later I felt for warm pipes but could not find any(all hot pipes meeting their...

Apologies if my last post did not make much sense. As I said I isolated all feeds except for the showers and the hunting continued. Please could you give a bit more detail on what your remaining tests are? Under what conditions do you want flow rate from the cold tap in the kitchen and...

Hi Tony I know you have asked for tests, although they have been diluted amongst all of our posts. I hope to do them one at a time in the evenings this week. Before I confirm the tests you are after can I say that last night I isolated everything (all WCs, taps, washing machine) except for...

I'm afraid doitall is correct. There is no exposed pipework really. Though they aren't in the walls, they are boxed in. Although if it is a leak I reckon it's on the new plastic pipework to the loft as apart from attaching the new taps etc the rest of the pipework is what BG installed and had no...

Thanks. That's what I wanted to know.... That it's not possible to isolate shower without pulling it down. That sounds silly that you have valves to isolate everything else but showers. I will do the tests as asked and report back afterwards. Thanks.

Well it has to either be a unit or a leak. Once units have been ruled out then it's about finding the leak. Am I barking up the wrong tree by asking about isolating the shower mixer as nobody has helped me out here. Surely these could be a problem and isolating them would give an answer. Please...

Tony. Could still be the mixer tap in the 1st floor bathroom and the three shower mixers. How can I isolate the shower mixers? Why did it take a couple of months for the pump to start hunting and then get progressively worse.

Nothing to do with boiler as that everything worked fine for a year after BG did installation (2009). It was only after renovation (2010) which involved plumbing in all new units and plumbing to loft that problem started. It is a BG 330+ high efficiency condensing boiler. I have the mother...

I can isolate everything except I do not mow how to isolate the showers. I have added a pick to my album for you to see and tell me. I will go through the house layout so that nobody is in any doubt but ignoring CH. Mains comes into house through basement. On the first floor we have the...