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Mend Horstmann H37XL Heating Control

horstmann ChannelPlus H37XL?

My oil heating is coming on without me setting it. Nothing is coming up on the display unit. The only way I can turn if off is by turning the main switch off for the Horstmann so its completely off but as soon as I switch it on again, the heating will come on again. Any suggestions would be much appreciated!!

Jen
September 2013
HorstmannHorstmann H37XLHeating, Home Heating SystemsHeating Control Horstmann
Hi my heating is working upstairs but not downstairs any ideas ? please help im freezing :

Dee
December 2015
to prove if it's the programmer slacken the 2 screws holding the programmer to the back plate hinge up the programmer off the back plate, does the boiler still run? If not, then it's the programmer. If it carries on running it could be one of the valves that is either stuck open or the microswitch is faulty

toptrish
September 2013

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Horstmann H37XL Heating On Itself - Help!