IMPORTANT: Troubleshooting of heaters should only be carried out by qualified Gas Safe engineers or Electricians.

All unit heaters (suspended from the ceiling) have a lockout reset button. Most controllers (thermostats at ground level) that are installed with unit heater have a lockout reset button on them.

See the section in our FAQ for the relevent controller.

IMPORTANT: Do not attempt to reset the heater more than 3 times, as dangerous fuel mixtures can build up. 

There are several reasons why a heaer can lockout. If the heater attempts to light 3 times but fails to maintain a flame, as a fail safe, the heater will go into lockout. If a heater overheats, it will lockout, or if there is a technical fault inside the heater, this will also cause it to lockout.

EUP Heater lockout Reset

Lockout: Red Light Permanently On

On the side of the heater, there is a red light. It it is permanently on, the heater has gone into lockout and must be reset. 

• This is done by pressing the black 'reset' button downn for 3 seconds and then releaseing. Most controllers also have a remote reset button; (See the FAQ section relevant to the specific controller) 
• If the heater has reset, the red light will start to flash (blink) on and off every second. 

Technical Problem Lockout: Red Light Rapid Flashing

If the red light on the heater is flashing rapidly, this indicates a technical fault inside the heater. To reset the unit:

• Hold down the reset button for 3 seconds and then release.
• If the heater has reset, the red light will flash on and off at one second intervals. 

Permanent Lockout: The Heater does not Reset after Pressing and Holding Reset Button

Should the red light stay on permanently after pressing and holding the reset button (not flashing/blinking), then the heater has gone into 'Permanent Lockout' 

This has happped because the heater has 3 failed attempts to restart in a row. 

You will need to contact a Gas Safe Engineer, or contact our Technical Team on 0121 506 7700 before resetting the heater. 

If the problems remains, or you are experiencing difficulties, please contact our Technical Help Team on 0121 506 7700 option 3  or email us at [email protected],