Have you ruled out a thermostat that's stuck open (which can cause a no-heat situation due to the engine not being able to reach normal operating temps)...as well as low coolant which can also cause a no heat situation?

I only ask because ruling out these possibilities is less expensive then purchasing a new IHKA control unit.

__________________
Become a BMW CCA member! Click HERE to join and feel free to use my BMW CCA member #191509 as a referral.

• 2015 f06 650ix GC (Moonstone exterior/Cohiba brown Merino Leather interior)
• 2014 f15 X5 50i (Space Gray exterior/Mocha Nappa Leather interior)