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Hi,

New here. Got a Lennox hrv5 installed by builder last year. We are almost on our 2nd year on our new house. Yesterday my hrv acted up, controllers on all washroom started blinking like Christmas tree same with the main digital controller (to control humidity and such) on my main floor blinking like crazy. What I did was check it the hrv is working properly by opening the unit and making sure the fans are freely moving then depress the power if everything is working. My next step was to unplug and plug it back after. Still washroom switch and controller is blinking like crazy and the rh% set is going from my set value to off. Is there something wrong with the main board or did I need to check something else? Kindly advice what is my next step.

Thanks in advance for your help

sounds like a bad switch or circuit board issue in the HRV. You should contact Lennox or the provider of the switch, even if your home builder warranty is expired the stuff inside your home still comes with a manufactures warranty.

See troubleshooting below.