Carrier Furnace Circuit Board Fuse

Twice in less than a 12 hour period my carrier 58cva furnace blew the 3 amp fuse in the control board.

Carrier furnace circuit board fuse.

A thin metal bar visible through a glass window on a screw fuse or viewed from the side on a plastic buss fuse will be broken on a failed fuse. The first time it blew the technician replaced the fuse and the system still wouldn t start. After putting my old honeywell ct3600 t stat back on the system ran fine for a few hours then blew the fuse again upon the start of a cycle. Condensate collector box rotted out and leaked water onto circuit control board shorting it out and tripping circuit breaker.

Electric furnace thermostat control wire. Replaced box 311 read more. Let s say you determine your carrier furnace circuit board has gone bad. Some people call it a control board but whatever you call it you need a new one.

What else could it be. Inspect the fuse or fuses to determine which fuse has failed. Fortunately you re in the right place for diy furnace circuit board replacement. He then determined it blew my carrier thermidistat.

I have a carrier furnace the furnace will not kick on. If you pull the 3amp fuse out then the fan will kick on. Your furnace s control board has a separate fuse that protects it from getting too hot. If someone is poking around your furnace and is not too careful they could more wires so that they come into contact with the furnace s wire frame causing them to short and blow the fuse on the furnace board.

Model number is xxxxx or o for last letter. I have replacd the circuit board and nothing. In many cases our carrier high efficiency furnaces also include technology that can produce enhanced comfort benefits and quieter operation as well. 30 and 40 year old furnaces we see still out in the field have these relays and switches.

Printed circuit boards these days are composed of shrunk down relays and switches mounted on a rigid green board to orchestrate the sequence of operations that start up the furnace and gives us heat. Current high efficiency furnaces can be rated up to 98 5 afue which can reduce utility costs over the life of the furnace. But the furnace will not ignite or run.