Operating instructions

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000 Normal Operation

001 Advanced warning - overvoltage Check to see if voltage between pins 13 and 14 of control

unit (external plug) is greater than 15 V or 30V.

002 Advanced warning - undervoltage Check to see if voltage between pins 13 and 14 of control

unit(external plug) is less than 10 V or 20V

010 Overvoltage shutdown Check voltage between pins 13 and 14 at the control unit

(external plug) is greater than 15 V or 30V. Check vehicle

charging system.

011 Under voltage shut down Check voltage between pins 13 and 14 at the control unit

(external plug) is less than 10 V or 20V. Check batteries

and connections.

012 Overheating Check for possible causes of overheat, check water

through flow (water circuit), sensor. Temperature at

temperature sensor is greater than 115°C. Impedance at

temperature sensor < 400Ω. Check difference at the

control unit, dismantle the control unit, disconnect the

internal plug from the control unit and measure the

difference between pins 5 and 8.

Overheat sensor values: 150 kohms at -25°C

10 kohms at +25°C.

013 Excessive temperature at flame sensor Flame sensor signals temperature of greater than 700°C.

Difference at flame sensor > 3400 ohms. Check the

impedance at the control unit (internal plug), dismantle

the control unit, disconnect the internal plug from the

control unit and measure the impedance between pins 10

and 12. Flame sensor values: 900 ohms at -25°C

1100 ohms at +25°C.

014 Possible overheating detected Difference of measured values at temperature sensor

>70°C (difference evaluation) Check temperature sensor

and overheating sensor, open heater slide valve and

check water throughflow. Check the impedance between

5 and 8 at the control unit (internal plug). Over

temperature sensor values: 150 kohms at -25°C

10 kohms at +25°C.

88 sseeccoonnddss