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What are you talking about?? The red reset pin is there to reset the boiler if it trips out. It has only done that when the thermostat was up to 5, not when set lower. When at 3.5 it never trips. I am simply asking the question why it would trip at 5 and not 3.5

Thanks. Yes I know the button is there for safety, but if its tripping when the thermostat is at anything higher than about 3.5 on the dial, I am querying why this happens? As I originally posted, I read that the safety trip is at approx 110deg. If even the highest setting 5 on the stat is...

Didn't know that, Im going to re balance today. I have a laser thermometer, although tbh, I simply went to the first rad, shut Off the lock valve, and opened it a quarter turn ensuring there was still a good hot water feed and the rad was still hot, moved to the next and so on. I gradually...

One of the TRVs causing the issue is a new Honeywell.

I'm just asking out of interest, as I have a way of stopping this, but I am curious as to why it happens When my Oil boiler thermostat on my warmflow boiler is set at about a bit under 4 everything functions fine. If I turn the thermostat up to 5, at some point it will trip the High Limit...

You wouldn't know the place now:-). and H+W specialise in Oil rig refurbs and Wind turbines nowadays. Anyway, back to topic. Im going to have another visit to this issue over the weekend, and measure the room temps of each individual room then have another go at the TRVs.

Thanks ericmark. Yes, if I totally remove the head, the rad works flat out and gets very hot. If I put the head back on with the dial at 5, then start to screw down, I can audibly hear the water flow restricting. So even at setting 5 (which I would have presumed would be 100% water flow...

Yes, did it just before fitting these TRVs. It was difficult, because I have a bungalow with 3 zones, Bedrooms/ Main house and water. I don't know the order of the rads in the chain, so just worked from the one nearest the boiler (in the garage) in zone 1 moving out from that to the furthest...

No, the pump was fine, Ive had it for about 7 years and all the rads with the old valves fitted were piping hot. No issues with cool rads anywhere in the house. When I set the TRVs to 5 the rads are piping hot as well. Its just the fact that anything under 5 and they are way cooler and not...

Ive posted some pics above. I done the hot/cool test on each rad before fitting. They are all on the 'hot first' pipe.

Thats when I noticed the issue. The rooms in question were not up to temp, and the rads were not at full heat. I understand they should come on at full heat until the desired temp via the TRV dial is reached. The only way I can get these rooms to match the heat in the room with the thermostat...

I might try that TRV. Although Im reluctant to fork out more money until I find out what's causing my issue.

Hi, thanks for the replies. yes, the valves have the two arrows. I should have stated, the rad I was talking about has the Honeywell TRV, the other new ones I fitted don't have a brand one them, photo below. But they all have the 2 arrows. Alsothe issue I mentioned in the first post is...

Just checked, the brand is Honeywell.

Cant remember the make tbh, I bought them back in March. It does seem strange. I have two heating zones, bedrooms and rest of house. In the hall and main bedroom where the two Nest thermostats are, I haven't fitted a TRV on the rad. These heat up really hot. However, if I go to the other TRV...

I have just fitted 12 TRV's to my radiators where there were none present before. Having read a bit online, most people seem to reckon leave the TRV about 3. However, at 3, my radiators hardly heat up, I have to leave all the TRVs at 5! Also, I have noticed, that some radiators with the TRV...

cheers. So effectively I have two checks at 3 bar? the Pressure reducing valve and further up the pipe, the Combination valve also set at 3 bar?

Connected on the cold mains in to my unvented pressurised hot water cylinder. Could anyone tell me what the 2 connections are in photo A above the stop cock. Photo C closeup looks like a Non return valve, and photo B a pressure reducer? would that be right? I had a plumber in about 5 years...

Thanks for the reply Kidgreen. Is there an easy way to check which taps or shower might be at issue?. I ask because we have 5 mixer taps and two showers in the house. Do I need to fit an NRV to each hot feed or can I just install one at the 22mm hot feed exiting the top of the hot water...

Hi. Looking for some advice with a few issues. I have an oil fired heating system and an unvented Santon Premier Plus mains pressure water heater. Specs as below. Maximum water supply pressure to PRV 16.0 bar Operating pressure of unit 3.5 bar Expansion vessel charge pressure 3.5 bar...