On a straightforward job, install and pair means checking the existing controls against the new model,
fitting or reconnecting the thermostat and receiver neatly, pairing the devices, and confirming the
heating responds before handover. The aim is a finished setup you can use straight away, not a box on the
wall with the app side left half-done.
What install and pair usually includes
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Check the current thermostat, receiver and boiler-control arrangement against the model being fitted.
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Fit or reconnect the thermostat and receiver neatly, with the visible finish kept as tidy as the
existing setup allows.
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Pair the devices and make sure the basic control setup is working before the visit is signed off.
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Leave the setup ready for app setup and handover, rather than splitting the job into awkward
unfinished stages.
What can change the next step
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Photos may suggest a straightforward install, but the existing wiring or control arrangement can still
turn out to be different on site.
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Poor previous work, awkward access around the receiver or partly finished earlier setup can push the
visit beyond a straightforward swap-and-pair setup.
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If the problem sits outside the thermostat or controls themselves, that should be explained clearly
before the job moves beyond the original plan.
Official sources and further guidance