Hi

We have 2 Daikin Altherma units. One is defrosting ok, the other does not seem to go into a defrost cycle. This morning, I had to thaw it out as it had over an inch of ice over all the fins!! Once restarted it quickly frosted up and is now barely producing any heat. The other unit is working fine.

My question is:- is there a way of "forcing" the unit into defrosting whilst I wait for an engineer to visit? The units have only just been serviced and it was noticed that the thermostat for the offending unit was not fixed to the side of the case, so he tucked into the case and I think maybe it's now not working correctly.

Many thanks
Simon