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Central Heating

Central heating does not heat main room to required temperature on the wireless room thermostat

Anonymous user 28/02/2024 - 3.26 PM

Boiler is Vaillant Eco Tec 28 - 2 years old. It has just been serviced. Wireless room thermostat is set to 21 deg. After four and a half hours the temperature only reached 19 deg. It's not that cold outside today.The largest radiator in the living room is not maintaining its heat and the bottom never gets hot. The boiler is activating its anti-cycling programme all the time but the other radiators keep hot. I have tried to re-balance the rads. I have three small ones in 2nd bedroom, bathroom, kitchen and hall. I have turned down the lockshield valves on all the smaller rads but they still get very hot. The largest rad is the furthest away from the boiler.Its lockshield valve and flow valve are fully open. The boiler's CH temperature is set at 62 deg. All rads have been vented. The system was powerflushed etc when this boiler was first installed 2 years ago. I don't understand the anti-cycling function.Why would the burners keep switching off if the thermostat temperature hasn't been achieved? I've never noticed it before.Any ideas what to do next?

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4 Answers

Anonymous user

Is your thermostat on an external wall thats cold to touch and therefore maybe not reading the correct temperature ? Also I wonder if you've an airlock in there somewhere due to the powerflush. Check the boiler is up to pressure about 1.5 bar . Bleed a few pints from each rad and refill the boiler each time . starting at the bottom of the house until you reach the highest one and see if it pulls it through . Open all the locksheilds again first .

Answered4 February 2017

D & R Property and Plumbing Maintenance

Rating: 4.9 out of 5

New Romney

from your description you do not have trvs on rads,this shoud have been done when new boiler fitted,so other rads still heat even if locksheilds are closed down,big rad may still contain sludge,we use a tool to vibrate rads when we power flush,you could also have a problem with pipe size to rad.

Answered6 February 2017

Anonymous user

I think the rad is airlocked. Turn off all other rads completely so the boiler is only pumping to that one. Wait a bit and check the both pipes are hot as each other. When they are u can turn others back on and should be ok. If not u need to call a plumber.

Answered1 August 2017

MA4 Plumbers

Rating: 4.9 out of 5

Clapham Junction, London

Hallo If the rad is cold on top there is air, if is cold on the bottom there is sludge. An air lock in sealed system it's possible, if pipe rise high and then come down at lower level, you should have automatic or manual air vent at higher point. My impression is that power flush wasn't done properly, or sludge accumulate at the far point from the boiler in the last 2 years. Redo power flush, check valves are in good working condition, (in and out), install a magnetic filter, and clean it often. I hope that helps Tiziano

Answered20 February 2017