ideal classic lxff flue boiler problem

[pinkbarbie]

hi the boiler isnt heating up any radiators
.the water is not too bad just warm. the boiler fires up then after a minute shuts down itself ,but the radiators are not even slightly warm as if no water is heating them.
the heating is on a danfoss thermostat controller which has a mind of its own and switches on/off varying times.sometimes everything works fine ist does this every couple of weeks then works ok again.
please help

 

[ChrisR]

Could be a sticky pump - or some other intermittent fault. Could be hard to find until it gets to be a "reliable" fault.

 

[pinkbarbie]

yes i had someone check it over he said he couldnt find fault as all cylinders where working and the boiler was having a good day ie turning on and off as required.
tbh the radiators where at least turning on even only for a few miniutes getting a little warm ,now there freezing

 

[LUNAT]

HI


1.faulty pump
2.blocked heat exchangers
3.faulty ch/hw sensors


need more details