Thermostat display completely blank and unresponsive; heating does not respond to thermostat changes.

Safety first: For mains-powered systems, isolate power at the fused spur or consumer unit before removing covers.

• Check batteries: On battery-powered Drayton thermostats, fit fresh alkaline batteries, ensuring correct polarity. Confirm contacts are clean and springs have good tension.
• Verify mains supply: For mains-powered models, check that the fused spur is switched on and the fuse is intact. Replace a blown 3A fuse with the same rating.
• Inspect backplate: Remove the thermostat from its backplate and check that the supply terminals are tight and that the live and neutral are present (test with a multimeter if competent).
• Test receiver LEDs: On systems with a separate Drayton receiver (e.g. SCR, Heat HubR), check that its power LED is lit. If not, trace and restore the mains supply.
• Replace thermostat: If power is confirmed at the backplate but the thermostat remains dead, replace the thermostat front module.