We have a Trane XL 80 (model TXC037C4HPCO, serial R435RF05G, mfg 10/2000) that was working well, used primarily for the aircon function until we got 16 inches of water in the basement. The water level got about midway up both the large circuit board and the blower fan motor. The fan and motor shaft spin freely. The unit was not on when the water hit. There are no visible signs of sparks or burns from a short. When power is turned on to it the thermostat on the wall comes on normally but there are no signs of life on the unit itself. On the back of the lower door to the unit it mentions a 5 amp fuse but I did not see where that is located. Could it be just a fuse or a dead circuit board and motor or something else. I think it is a White-Rogers board. The replacement procedure looks fairly straightforward. Any advice on the best way to proceed?

Hello, I am having a problem with my furnace blower that started about 2 months ago. When the outside air unit turns off, the furnace blower sometimes doesn't turn off. Around that time, it happened once or twice a day. Everything was fine for about a month and it happened again on one day then it was fine until a few days ago. When this happened, the fan was always set to Auto on the thermostat. Turning the Air/Heat switch to off would have no effect and the blower would continue to blow air. The only way to stop it was to turn the furnace off at the circuit breaker for more than a minute, less time and the blower would come back on. Three days ago it started happen again but turning off the power to it would not fix it. I did notice that it was less likely to malfunction during the night. Now it never turns off unless killing the power at the circuit breaker. When the house temperature gets below the set temperature, the thermostat clicks and the outside A/C unit turns off. After about 90 seconds when the blower should turn off, I notice about a 1/2 second drop in the air pressure coming out of the vents and then air coming out doesn't seem to be as strong as when the A/C unit is running. I've done some research and what I've read seems to indicate that it might be a bad thermostat or fan relay. What would be the best way to figure out where the problem is? The furnace is a Nordyne G6RA-096C-16. The air units are S3BA-024KA (outside) and C3BA-030C-B (inside).