Zehnder Q Mid Sensor Remove and Replace

Sometimes a mid sensor goes bad and needs replaced. It senses the fan speed and pressure. Although not common, here's a reminder on how to do it if we have to do it again.

[@Andi-sk5cg]

Very good. I‘ve tried this on both sides and the Unit works without error. Used a compressor with 6 bar. Thank you for this Great instructions. 👍

[@mickeymallory2316]

Acc to Zehnder the sensor is not broken quite often. You just have to clean it. I tried to blow out the differencial pressure sensor with the 2 nozzles with my mouth but it didn't work. Than I took a bicycle pump with a small nozzle for a football. I put it 1cm in front of the 2 nozzles. It worked fine and it's running without any issue for 2 weeks now. Before the sensor didn't work correctly.

[@Lusitert]

Thanks alot for making these video's. You are saving me a ton of time & money!

[@PassiveHouseCody]

That made our day. You are very welcome friend.

[@leszekkozlowski2651]

Thank You sir. You are the best

[@simoneredoglio4916]

Is this the sensor eha?

[@PassiveHouseCody]

clarify eha..? Q units have a mid-sensor and an upper sensor.

[@simoneredoglio4916]

@@PassiveHouseCody i have this error on plc: SENSOR_EHA ERROR SENSOR_ EHA ERROR

[@PassiveHouseCody]

@@simoneredoglio4916 you'll want to have 6.10 open and handy :) itsh a little deep. That's a fan error. Pg. 39 www.zehnderamerica.com/wp-content/uploads/2022/05/ComfoAir_Q_Service_Zehnder-America_EN_2022.05.18.pdf

[@imlauerbalazs2367]

It is worth setting the machine to service mode before doing anything, so that it does not get stuck when the bypass is removed.