Carrier Furnace Circuit Board Fuse

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.

Carrier furnace circuit board fuse.

Replaced box 311 read more. Some people call it a control board but whatever you call it you need a new one. 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. Twice in less than a 12 hour period my carrier 58cva furnace blew the 3 amp fuse in the control board.

But the furnace will not ignite or run. Inspect the fuse or fuses to determine which fuse has failed. 30 and 40 year old furnaces we see still out in the field have these relays and switches. Model number is xxxxx or o for last letter.

What else could it be. I have replacd the circuit board and nothing. Just enter your carrier model number in our parts finder choose your shipping options and purchase the. The first time it blew the technician replaced the fuse and the system still wouldn t start.

In many cases our carrier high efficiency furnaces also include technology that can produce enhanced comfort benefits and quieter operation as well. Current high efficiency furnaces can be rated up to 98 5 afue which can reduce utility costs over the life of the furnace. There may be a number of fuses depending on the furnace system. If you pull the 3amp fuse out then the fan will kick on.

Fortunately you re in the right place for diy furnace circuit board replacement. Electric furnace thermostat control wire. He then determined it blew my carrier thermidistat. 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.

Your furnace s control board has a separate fuse that protects it from getting too hot. 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. I have a carrier furnace the furnace will not kick on.