M I arrived at our clients home for the upstairs zone not properly cooling down. Jon had left the upstairs space intentionally warmer to try and replicate the issue he was describing and seeing. It is an intermittent issue that is occurring when the upstairs zone is calling only. The zone damper motor is sticking and not opening. This causes the relief duct/vent over the awning to receive 100% of the air since both zones motors are remaining closed. I tested and inspected the zones and ensured that the board was sending the proper signal/ power to control the motors. I did find the resistor for the hot surface ignitor to be visibly charred, evidence of heavy usage and age. I created an estimate to replace both damper motors only and another estimate to proactively replace the board along with the motors. We are tentative to return Wednesday depending on the repair option they elect to move forward with.
