A repairman recently found that the actuator and the high limit switches were not working when our 15+ Carrier gas furnace was only blowing cold air. There are separate thermostats for the downstairs and the upstairs.
I understand that he bypassed both of these controls until parts were ordered.This was on a Friday and left operating at full capacity like that until the new parts were installed the following Monday. Meantime, when he returned that Monday the coil on top of the unit had overheated and melted, as did a section of the ducting. My friend who lives downstairs said after the repair, when he got home from work, the CO alarm was going off.
Can these controls be bypassed and the unit allowed to operate for 3 days? I thought that this method of bypassing these controls should be for testing the unit on a temporary basis for testing, not left to have it operating at full capacity for this length of time. Could this have caused the further damage that was not present that Friday? Also, could any of these factors cause the CO alarm to be activated after the final repair? I was out of the state when all of this happened.
Please advise. Thanks.