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Code Description
A0 NTC sensor TEWT defective.
A1 NTC sensor T1 defective.
(= temperature of the outside air)
A2 NTC sensor T2 defective.
(= temperature of the supply air)
A3 NTC sensor T3 defective.
(= temperature of the return air)
A4 NTC sensor T4 defective.
(= temperature of the exhaust air)
A5 Bypass motor malfunction.
A6 Preheater motor malfunction.
A7 Preheater does not heat up suffi ciently.
A8 Preheater becomes too hot.
A10 NTC sensor Tch defective.
A11 NTC sensor Trh defective.
E1 Exhaust air fan not running (M1).
E2 Supply air fan not running (M2).
E3 Temperature sensor extractor hood too
high.
EA1 Enthalpy sensor measures excessively
high moisture values.
EA2 No communication with the enthalpy
sensor.
Caution!
The electrical connections must not come into contact with moisture.
Pay attention during installation of the heat exchanger and drain plate that the condensa-
tion drain is on the same side as the condensation drain fi tting.
Inspect the components of the condensation drain every 2 years.
4
37Instructions for the Installer
4.7 Malfunctions
In the event of a malfunction in the MTD-ERV 350:
• A malfunction indication normally appears on the display of the CC Ease operating unit.
Not all malfunction indications appear on the CC Ease display, however, even when there is a malfunction (or
problem). Both types of malfunction (or problem) are described briefl y in the following sections.
4.7.1 Malfunction Indications on the CC Ease Display
The following table contains an overview of the malfunction indications that are shown on the CC Ease dis-
play.