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Comparing the defective with the good--- --- something has happened inside the head to cause it to not open the valve at all. I have been looking on internet and I can get replacement heads. Reading the info. they mention "contract" valves. Could these be a cheaper version of the petite model...

Comparing the inside of the head at the lower end with a working valve the plastic insert which contacts the valve plunger is 4 or 5 mm lower when the valve is fully open. So, even when the head is open fully the insert in the head is holding down the valve body plunger.

Is there a replacement Myson Thermostatic valve head for the Myson Petite model which are fitted to a number of my radiators? ( I have two which are not operating correctly) Thanks

Once again thanks to you all for the information. I have decided to drop the idea of a hot water convector due to the limitations of my system and am going to install the all electric myson kick space heater. Thanks again.

Thanks for all of your information. It is my intention to install a 500 as a boost unit to the existing double panel Radiator. I plan to operate it from a myson thermostat so as to be only in operation for minimum durations. Unfortunately, it was also my intention to tee off the existing 10mm...

Has anyone experience of running one of these on micro bore powered from a Worcester 34cdi? Myson say has to be piped on 15mm ?? This would be impossible with present set up.

I have a Time Guard TRT035 THERMOSTAT set to the 0.5 c range but the response to temperature changes is very poor. Can anyone please recommend a similar unit with a better temperature response.

Thanks John. One correction I have to own up to is that after sending my question I cleaned the motor thoroughly and found it was a UDS 1053SN model. Spares on the way from eSpares. Thanks for your trouble. John

Can anyone please advise a supplier of replacement carbon brushes for Numatic Motor type UDS1058N. This motor type seems a difficult one to find brushes for.

Yes You are exactly right. The heating had been on for a short period before I started the changeover. I didn't realise that it had been on long enough to bring the HW cylinder up to it's set temperature via the tank stat. I have tried to calculate all of the load supplied via the fused spur...

I feel such an idiot involving you in my incompetence. It turned out that the HW Cylinder Thermostat had closed at it's set temperature. As soon as I increased the setting--- power to boiler for HW . I really appreciate your assistance and wiring was A1 as per your post. Invensys Technical...

D Hailsham esq. Contacted Invensys-- 5amp Fused spur ok. In process of installing at this moment and have hit a snag. Transferred wiring as your instructions in original post but Hot water will not start unless CH is either on ONCE or On. Hot water cylinder is cold so thermostat must be...

I seem to have discovered another "concern" as regards this change. The existing Switchmaster timer is supplied from a switched fused spur fitted with a 5 amp fuse. ( The boiler is a Firebird 90 s and the installation instructions state this is to be supplied via the 5 amp fuse so--...

D Hailsham, Sincere thanks for the information. Yes the system has an Honeywell valve identical to the one in the picture.

I intend upgrading a Switchmaster sm 600 controller to a Lifestyle LP522. All of the information I have obtained on the switchmaster shows " no connection" to terminal 4 in the backplate. I opened mine and I have a wire terminating at 4 as well as wires at Terminals 1 and 3. The system is...