What settings are lost if the TRM or CTR towel rail is switched off at the wall? How long will the time be remembered by the controller when powered off?

The TRM & CTR towel rail controls will remember all configured settings when powered off, except the current time and any PIN code, if set. The current time is only held for around 3 hours in the event of power loss, by the use of a small backup capacitor (not a battery). 

Applicable to models:  TRM21W4, TRM14W5, TRM21W5, TRM28W5, TRM21C4, TRM14C5, TRM21C5, TRM28C5, CTR7W, CTR7C, CTR10W, CTR10C, CTR12W, CTR12C