Carrier Corporation manufactures furnaces under the brands of Carrier, Bryant and Payne. Most parts are interchangeable. The most common hot surface ignitor for Carrier, Bryant and Payne furnace is LH33ZS004. It replaces LH33ZS001, LH33ZS001A, LH33ZS002, LH33ZS002A, LH33ZS003, LH33ZS003A and LH33ZS004A. This is a very common failure item and should be kept as a spare. It is quite simple to change. The only tools needed are a 1/4" nut driver. Extended length with magnetic tip makes the job easier. Common cause of failure is insufficient air flow such as dirty filter or restricted ducts. Make sure registers are open and returns are not blocked and evaporator coil and blower wheel are clean. air flow will cause the burners to cycle on limit switch. Switch may trip 8 or 10 times during a heating cycle causing ignitor to repeatedly heat up and cool down.