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How to check firmware versions on Velit air heater

It's often required to know the current firmware versions at the start of any technical support request with Velit. 

Check ECU firmware number - Short press the dial till the set system time page. We need the last couple of characters. In this case, P-V3.18

Check thermostat firmware number - Power cycle the heater or disconnect/reconnect the thermostat. The number shows at the bottom of the screen for around 2s when booting up. If there is OTA at the end, you can use the phone to run the latest update first.