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Hi,

First post, just joined in the hope someone may kindly be able to help with the problem as per the thread title. I will explain the setup:

On non mains water into holding tank then fed into house, into 2 accumulators via a Mainsboost charger. Been working fine for many years. During recent cold weather the external pipes/tank froze. This happens quite often due to being in an area which has very cold weather. Once defrosted everything normally kicks back in working. This time we received an error on the mainsboost charger saying it had failed. It had indeed failed and has now been replaced. So onto the issue, following the charger replacement, only 1 of the accumulators is filling. Plumber has checked everything he thinks and ST (Stuart Turner) tech help have been very helpful but to no avail.

Having tested the diaphragm in the vessel which is not filling, there is no water coming out of the schrader valve so the presumption is it is fine. All inlet valves are open to the vessel.

There has been lots of mentions of the vessel pressure. Today the readings for the 2 vessels were 0.95 bar for the one filling and 1.2 for the other one. The suggestion was to set the pressure to be the same for both which we have done. The mains pressure reading is 1.5 bar, so am I right in thinking the differential will mean the pressure on the vessels needs to be lower?

On setting the pressure on both vessels to 0.95bar and restarting the charger the same thing happened, only 1 vessel filled. If we shut off the inlet valve to the vessel which is filling and only leave the other one open, still no water goes into it. The charge continues running until the auto 180min cutout kicks in.

I really am hoping someone can help. Is there anything else, obvious or not, which is likely? We are in a very rural area and finding plumbers who can help is proving difficult. ST do not have any technicians anywhere in the county.

Many thanks in advance.
 
Very good, just to say it "cant" be any problem with a NRV in the mains as that is what is being boosted! so possibly NRV in the pump itself.
Thanks John. I will get the plumber to check all the valves again, plus the charger as well as speak to ST.

I have changed the setting on the charger to 2.2 and thankfully the charger has stopped. Having also used some water since, when the pressure drop is higher than the 0.5 differential setting the charger automatically comes on.

Once again many thanks for all your help.
 

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