[SOLVED] Sticking Thermostatic Radiator Valves (2026 Update) Solved

Milleniumaire · 2004-09-19T12:37:33+00:00

The central heating system in the house that I bought as new 5 yearsago is fitted with Pegler Terrier II thermostatic radiator valves. About a year ago I noticed that on a couple of radiators even when thevalve was turned off (* setting) the radiator remained hot so Iassumed the valve had failed and replaced both valves. Having justdrained the system and refilled it with Fernox cleaner I have noticedthat another 3 radiators are staying hot when the heating is onregardless of whether the valve is turned off or not! It seems thatthe small pin is not being pushed down by the head. I have triedswapping the heads with heads from other radiators which are workingokay but this doesn't seem to make any difference. This confuses meas I thought the problem was in the head not in the valve (the partconnected to the radiator).Can anyone explain how these valves work and what is going wrong? Isthere any way of repairing them or do they need to be changed? Have Igot a bad make and need to switch all the valves before they continueto fail (I would rather resolve the problem in one attempt rather thanspend the next 5 years having to change individual valves as theyfail).Thanks in advance for your advice.Regards.Paul.

Sep 19, 2004 Last reply: 7 months ago 44 Replies

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wasbit 8 months ago

Poorly thought out gadget. How are you going to remove it from the pipe? Might be slightly easier if the pipe didn't go into one of the corner holes.

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Tricky Dicky 8 months ago

The corner holes have a split to allow fitting to pipes and for easy removal. I have two and found it easy to swap over as they fill by opening and closing the air vent you can control the draining.

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