Set Appliance State:

Mains Power Off
Turn Hot Water Tap On
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance as necessary (hold down both arrow buttons until display changes).
Does the fan run with a DHW demand?
Does fault code 2910 reoccur?
Note:
If a different fault code appears click HERE.