Oil Central heating boiler problems

[murphs14]

Hi I am new to the site and would really appreciate some advice. I have a Bosch Worcester Heatslave 15/19 boiler. The heating Thermostat knob on the front panel clikcks right at the start of its clockwise travel and fires or turns the boiler off no matter how long the boiler has been fired and is running. Am I wrong to expect the click and the boiler to fire further up the scale. It can be running for hours and still click if turned right at the bottom temperature.
Also the Honeywell roomstat sometimes the light is on either side of the click if that makes sense. I thought the light came on as the temperature knob was turned and you heard the audible click as the stat called for more heat. Do you think the two things could be related.
Thanks in advance for any help.
Peter

 

[dontknowitall]

It sounds as if something is not working as it should. The room stat should call for heat if the room is cold (and one assumes the light comes on when it's calling for heat). The boiler's thermostat is normally around 60-70% up (e.g. 3.5 on a scale of 0-5).

When the central heating is on, the boiler should fire if the room stat is calling for heat. When the boiler is up to temperature or the room stat is up to temperature then the boiler should stop and await another call for heat until the central heating is turned off.

I hope this answers your question so you'll know whether to get someone in or not. In your case an electrician can often sort out these problems.

 

[murphs14]

Thanks for your reply.
The real mystery is the stat on the boiler clicks when the knob is roatated right at the beginning of it's travel no matter how long the boiler has been fired. I am guessing that if that is the case, the stat doesn't recognise when the boiler itself has reached temperature and keeps going gulping down the precious juice.
As far as the roomstat is concerned, the fact that only sometimes the little light is on no matter where the knob is positioned either side of the "click" makes me think it's probably faulty and needs replacing. Are they a pretty standard item or does the wiring differ from type to type?
Peter