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39Instructions for the Installer
E3
Extractor hood temperature
sensor too high.
Resistance OK?
Yes No
Replace PCB
Caution:
Reset unit!
Replace
temperature sensor
Caution!
Avoid contact with the
PCB and frost protection
element due to risk of
electrocution
Is something
cooking on the hob?
Yes
No
Turn hob off and
remove item from
heat source
Caution!
Avoid contact with the
PCB and frost protection
element due to risk of
electrocution
E A1
Moisture sensor registers >60%
relative humidity in exhaust air.
Consult the user;
fit standard heat exchanger??
E A2
Cannot read out moisture
sensor
Resistance
OK?
Yes No
Replace PCB
Caution:
Reset unit!
Replace
temperature sensor
Caution!
Avoid contact with the
PCB and frost protection
element due to risk of
electrocution
Connection
between sensor
and PCB OK?
Yes
Check sensor
resistance
No
Repair
connection
E4
MTD-ERV 350 switched off
via external switch
Cause depends on unit
connected to the MTD-ERV 350:
check the connected unit.