The error code ETC 001552.04 is triggered when the control unit measures 0 volts at the signal input of the temperature control. This indicates a short to ground in the internal circuit of the control unit.

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The error code ETC 001552.03 is triggered when the control unit measures a voltage in excess of 5 volts at the signal input of the temperature control. This indicates that the internal circuit of the control unit is shorted to a supply lead or is open.

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The error code ETC 001549.13 is triggered when the heater valve (B131) is found to have an invalid calibration or is not yet calibrated. Proper calibration of the heater valve is essential for accurate control and operation within the heating system.

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The error code ETC 001549.07 is triggered when the control unit receives a valid position signal from the heater valve potentiometer (B131), but the heater valve cannot be moved to its desired position via the motor’s connecting leads. This indicates a mechanical fault at the heater valve or an open line at the motor’s connecting…

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The error code ETC 001549.04 is triggered when the control unit measures too low a voltage at the motor connecting leads 2016 and/or 2027 of the heater valve (B131). This indicates that the circuit is grounded.

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The error code ETC 001549.03 is triggered when the control unit measures excessive voltage at the motor connecting leads 2016 and/or 2027 of the heater valve (B131). This indicates that the circuit is shorted to a supply lead.

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The error code ETC 001547.04 is triggered when the control unit measures 0 volts at the signal input for the evaporator core temperature sensor (B129, lead 2018). This indicates a short to ground in the circuit.

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The error code ETC 001547.03 is triggered when the control unit measures a voltage in excess of 5 volts at the signal input for the evaporator core temperature sensor (B129, lead 2018). This indicates that the circuit is shorted to a supply lead or is open.

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The error code ETC 001546.04 is triggered when the control unit measures 0 volts at the signal input for the heater valve positioning potentiometer (B131, lead 918). This indicates a short to ground in the circuit.

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The error code ETC 001546.03 is triggered when the control unit measures a voltage in excess of 5 volts at the signal input of the potentiometer (heater valve B131, lead 2038). This indicates that the circuit is shorted to a supply lead or is open.

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The error code ETC 001079.04 is triggered when the voltage measured at the positive lead (lead 2093) of the power supply to the 5-volt components (refrigerant pressure sensor B130, heater valve B131, and motor for adjusting the air distribution flaps B132) is less than 0.5 volts. This indicates a short to ground in the circuit.

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