S
ERVICE
A
IR
HEATER
en-76
en
7.3
Removing the control circuit board
1. Switch the unit off using the control panel.
Warning:
w
Shut off the mains supply.
The unit is fitted with 2 mains power cables.
Ensure that the power supply to the control
circuit board is also shut off.
2. Open the electronic housing: undo the screws
1
at the
bottom of the housing, tilt the cover
2
and lift the cover
off the unit.
3. Disconnect all connectors attached to the unit and earth
connections from the control circuit board.
4. Remove the screw
3
.
5. Slide the control circuit board
4
loose and lift it out of the
unit.
7.4
Connecting the control circuit board
Warning:
w
Make sure that the mains supply is switched
off
1. Slide the control circuit board into its place and screw it in
firmly.
2. Connect all connectors and earth connections to the con-
trol circuit board again.
3. Switch the unit on and check the operation.
Note:
n
With a new control circuit board, an E1 error may
occur because the old control circuit board can no
longer be found. Resolve this by reconfiguring the
system via
menu > Maintenance > Reset system
