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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...

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

New Honeywell Room Thermostat set at 25 degrees (Same problem with old thermostat - comes on below 16 degrees cuts off at 18 degrees) Boiler setting 5 (top setting)

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 thermstat fitted. Boiler fires up when the room below 16 degrees, but cuts out when 18 reached It keeps coming on throughout...