Boiler Not Responding to Controls
Turning the thermostat or programmer up makes no difference at all..
Turning the thermostat or programmer up makes no difference at all.
What is actually going on
Turning the thermostat or programmer up makes no difference at all.
The realistic causes, in order
A wiring fault at the boiler terminal strip, often after unrelated electrical work A failed programmer or a stuck relay in a wiring centre A boiler left in a service or installer mode after a previous visit
What we test on site
Switched live at the boiler under demand, which isolates the fault in one measurement Wiring centre terminals and links against the correct diagram Boiler parameter settings, including any installer-mode changes
Get a boiler ignoring its controls diagnosed properly
A meter reading at the terminal strip normally settles this within minutes of arriving.
Questions we get asked
Is a boiler ignoring its controls a controls fault or a boiler fault?
A wiring fault at the boiler terminal strip, often after unrelated electrical work
What normally puts a boiler ignoring its controls right?
A meter reading at the terminal strip normally settles this within minutes of arriving.
Is it safe to keep using the system with a boiler ignoring its controls?
Heating control wiring is low voltage in appearance but mains in reality. It should be worked on with the supply isolated and to the manufacturer's diagram.