Service manual42
TROUBLESHOOTING Blower Does Not Work!
If the blower does not work, proceed as follows:
1• Verify if the "Blower" marker is
displayed when you press the
respective key.
2• If the "Blower" marker is not
displayed, use a spare top side
control to see if the first is
defective.
In the latter case, replace the
defective top side control.
If the original top side control is
not defective, replace the board
referring to the "How to Replace
the Board" section of this manual.
"Blower" marker
To increase the lifetime of the relay, a circuit called "snubber" is used on the blower relay.
With this type of circuit, if no blower is connected to an output and the relays are open, the
multimeter will still read voltage of around 60 V. This is normal.
It is important to measure voltage when the blower is powered on!
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