The H72 error means your thermostat has lost power. How you troubleshoot this depends on if your thermostat is on a stand or installed on the wall.
On a stand
- Make sure that the power cable is fully inserted into the power plug and that the plug has been pushed all the way into the wall socket. Check that the wall socket is switched on.
- We recommend plugging your thermostat into a socket that isn’t controlled by a wall switch to prevent accidentally switching it off.
- You can also double-check that the socket is delivering power by plugging in a lamp or other electronic device and turning it on.
On the wall
- Make sure that the thermostat display is completely attached to the base. If it’s not, push it down on the base until you hear it click.
- Try moving the Heat Link:
- Before you move the Heat Link, turn off all power to your home at the fuse box.
- Move the Heat Link so that it is at least 30 cm away from the boiler or other large metal objects.
- Also check that there isn’t anything directly between your Heat Link and thermostat, like a large mirror or refrigerator.
- After you move the Heat Link, turn the power to your system back on.
There are some other things you can check that apply regardless of whether it's on a stand or on the wall.
- Check the fuse for your system's power. It’s possible that the fuse controlling power to your system isn’t properly seated or is blown. Turn off the power to your system, then check the fuses. Re-seat or replace it as necessary. Before you do this, you might want to refer to the manufacturer's manual or website for exact instructions and safety precautions.
- Make sure that the switch is set to on. Sometimes, fuse switches can look like they’re on, but haven’t been flipped on all the way. Try flipping the switches that control power to the Heat Link and your thermostat off and then on again.
Let us know how you get on!
