DIY Doctor

Thorn Heating Olympus 38/50B not responding to thermostat

Postby doctorrocket » Fri Mar 29, 2013 12:04 pm

The above boiler has been excellent for 25 years.
Recently, the temperature in house started to decline. The recirculation pump has been changed, and a new Honeywell thermostat fitted.
Boiler fires up when the room is below 16 degrees, but cuts out when 18 reached
It keeps coming on throughout the day, but never exceed 18 degrees (The same thing happened with the old thermostat)
The New Room thermostat is set to 25 degrees

Additional Information:
I closed down the boiler and then went through the To light the boiler procedure
The Pilot light lit immediately
However, according to the instructions, you then turn the boiler thermostat to 5, and the main burner will start.
The Main burner did not start

Additional Information:
The boiler has only been coming on every few hours.
When it last came on, it ran for approximately 15 mins then went off.
I turned up the boiler thermostat, and it came on again.
It went off 10 mins later
I then turned up the boiler thermostat again, and it came on.
When it stops, the circulation pump stops as well
It appears that when the boiler reaches temperature, it shuts everything off
It seems as if the room thermostat has no influence on the boiler, yet this was the same with the old thermostat (which is why we changed it) as well as the new one, so it should not be the new thermostat
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