Alarm 2 Supply air temperature below 5 degrees, flashing 2 on the control panel.
Check that the reheating coil is not switched off, parameter 31 should be in the ON position.
Are the air flows adjusted, measured by an expert? The exhaust air flow should be slightly higher than the supply air flow. See brochure and parameter list, check parameters 11 to 18 which are fan settings.
Are filters very dirty? Check the special exhaust air filter and change if necessary.
At A70T, if the basic flow in the kitchen is taken via the cooker hood, this leads to lower heat recovery and problems maintaining the correct supply air temperature at low outdoor temperatures. Check the damper disc in the cooker hood by removing the filter, the damper disc should close tightly when the damper control closes the damper in the hood.
There should be no opening in the damper disc, tape the opening shut to urgently solve problems with low supply air temperature, basic flow in the kitchen should be taken via a separate exhaust air outlet and not via the cooker hood.
Will alarm come at high outdoor temperature? On the circuit board there are 3 relays, 2 are next to each other and 1 alone which is the relay for the after-heating battery and it is this single relay for the after-heating battery that should be replaced. Relay opposite terminals 25-26 or relay opposite terminals 27-28 can be used if nothing is connected to these terminals for replacement of the afterheater relay (used as a spare relay).