DIY Doctor

Main navigation

Got hot water but no heat

Postby Janeym » Tue Oct 16, 2007 1:36 pm

I have a back boiler - Gloworm of some description - which works ok. Thermostat in hallway downstairs clicks when turned up to higher temperature and the control unit in the airing cupboard shows both hotwater and central heating as being on BUT I have no central heating to the house, up or downstairs. Plenty hot water, but if I turn off the water and turn on the heating manually, there is no sound fom the boiler whereas normally it would fire up. Please help, I'm freezing!
Thx :(
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Tue Oct 16, 2007 1:30 pm


Simply Build It

Postby htg engineer » Tue Oct 16, 2007 4:10 pm

Is this a fully pumped heating system ?

Sounds like a problem with the actuator/3 port valve.
htg engineer
Rank: Project Manager
Posts: 3256
Joined: Tue May 22, 2007 5:22 pm

Postby The Heating Doctor » Tue Oct 16, 2007 6:49 pm

I think it's the end switch in the motorised valve on the heating side. When your motorised valve gets to it's full open position a switch is closed, this closed switch in turn fires the boiler. The switch wires are the white/ orange wires but these colours can vary depending on make. If a Honeywell, ACL, Drayton, Sunvic and some others the head (known as a actuator) can be changed with out draining down the system. If you are ok with electrics my suggestion of the fault can be checked by going through the wiring.
The Heating Doctor
Rank: Foreman
Progress to next rank:
Posts: 214
Joined: Mon Aug 27, 2007 9:49 am

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics