Pulling fuse 5 will stop it working completely.
You might find the environmental sensor (a 5°C frost thermostat really) has failed, making the FBH run as though it's below 5°C, assuming it's above 5°C of course.
Pulling fuse 5 will stop it working completely.
You might find the environmental sensor (a 5°C frost thermostat really) has failed, making the FBH run as though it's below 5°C, assuming it's above 5°C of course.