Heater fault

[Juddy1973]

Hi guys, I have a 2012 KUN26 that has a heater issue.I see someone had the same issue in 2015, I have tried the solution that someone suggested with no luck, which was remove ECU fuse for 30 seconds then replace and hit the hazard button. My heater light flashes orange 46 times before the unit will work, and comes up with fault codes 21,41,42,43. It cools, but won't heat. Its like the actuator isn't working. I have had to replace the main fuse so this may have something to do with it. Anyone have any solutions ? Cheers

[Rob_Wood]

Hi guys, I have a 2012 KUN26 that has a heater issue.I see someone had the same issue in 2015, I have tried the solution that someone suggested with no luck, which was remove ECU fuse for 30 seconds then replace and hit the hazard button. My heater light flashes orange 46 times before the unit will work, and comes up with fault codes 21,41,42,43. It cools, but won't heat. Its like the actuator isn't working. I have had to replace the main fuse so this may have something to do with it. Anyone have any solutions ? Cheers

I'm unsure of that particular system, however simple fault finding techniques ... Look for what you suspect first. Have a look at the actuator itself, has it got something jammed against it that stops it from working this (over time) will cause it to burn out and then blow fuses. How often do you use the heating cycle? irregular use can cause the water in an unmixed coolant system to commence corrosion within solenoids and the like, making them jam up.
Sorry I can't be of more help, I'm just spit-balling a few ideas as I'm typing.
Let us know how you go.

[ptommo59]

21 Solar Sensor Circuit
41 Mixing flap control servo motor circuit (passenger side)
42 Air Inlet Damper Control Servo Motor Circuit
43 Air Outlet Damper Control Servo Motor Circuit

21 - An open in cooler thermistor (solar sensor) circuit.
The cooler thermistor (solar sensor), which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output current from the cooler thermistor (solar sensor) varies according to the amount of sunlight. When the amount of sunlight increases, the output current increases. As the amount of sunlight decreases, the output current decreases. The air conditioning amplifier assembly detects the output current from the cooler thermistor (solar sensor). Code can be output in normal operation if test is done in dark place.

41 - The air mix control damper position does not change when the air conditioning amplifier assembly operates the air mix damper servo sub-assembly.
The air mix damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the air mix control damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air mix control damper to any position. As a result, the air mix control damper varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air blowing toward the driver and front passenger side is as requested.
This DTC is also output if the damper and damper link are malfunctioning or unable to move properly. When this DTC is output, confirm that the mechanical parts of the damper and damper link are not defective or damaged.

42 - The air inlet control damper position does not change when the air conditioning amplifier assembly operates the recirculation damper servo sub-assembly.
The recirculation damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air inlet control damper to any position, which controls the intake air settings. This DTC is also output if the air inlet control damper and damper link are malfunctioning or unable to move properly. When this DTC is output, confirm that the mechanical parts of the damper and damper link are not defective or damaged.

43 - The mode damper position does not change when the air conditioning amplifier assembly operates the mode damper servo sub-assembly.
The mode damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the mode damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the mode damper to any position, which controls the mode changes. This DTC is also output if the mode damper and damper link are malfunctioning or unable to move properly. When this DTC is output, confirm that the mechanical parts of the mode damper and damper link are not defective or damaged.

From Manual When DTC 41, 42 and 43 are output at same time, there would be malfunctioning on power source circuit"" It indicates that the ECU-B No.2 Fuse (7.5A Fuse 22 in Engine Bay Fuse Box) could be blown or wiring to aircon control circuit from fuse is faulty. If not either of these could be a fault in the air con amplifier.

[Juddy1973]

Thanks fellas. Ptommo59 I will have to check my manual again as I couldn't find those fault codes. I suspect you are on the right track here though, as the heater worked fine til I had to change my main fuse. I had to jump start it once and the fella that put the other end of the jumper leads put them on the wrong way and blew the main fuse.

[Gipsy]

Never trust a fella with a set of jumper leads