Help! Ibiza 1.2 tsi U016400

[Reese Hodgers]

I have a ibiza 1.2 tsi fr 2017 6j engine code: CJZC.
Out of nowhere today I got this fault code:
U016400 lost communication with HVAC and then followed by this fault code: P021900.
The A/C sounds sounds weird when I turn it on but it does still work, also when it first came on I had only literally started up the engine and MIL was on, turned off the engine and on startup the Engine light went off but faults are still scanning..
Anyone know what's wrong?

 

[RUM4MO]

Have you tried clearing all stored faults, this might just have been "one of these things" ie nothing/rubbish.