Furnace thermostat error jumper
Error jumpers are an emergency measure to manually change the location of a cause of a furnace to a non-emergency one. This allows utility workers to restore power without access and changes it back again when they are able if the situation warrants it.
There may be more than one error jumper in your system and they will all be near wires that operate that part of the HVAC system like the heat anticipator or higher furnaces only heating the upper section. They can be found in bundles that look like odd pieces of equipment wrapped with some electrical tape and included with other groups of wires for parts of equipment on your system, usually on your breaker box or fuse box terminals.
Furnace thermostat error jumper. Check the device cases to see if there is a sticker that states this number. If not, look for a sticker on the device that says “Caution: do not open, no user-serviceable parts inside.” There will most likely be a pipe wrench or screwdriver in that package to unplug and reconnect your furnace from the gas valve.
It is important to troubleshoot and identify the problem with your furnace before fixing it using this method. If you feel confident in identifying the cause of the issue and have verified that there is no exposed wiring or any deterioration on it, then proceed with these instructions by shutting off electrical power at the breaker box to prevent fire hazards as well as personal injuries.
A furnace’s thermostat error jumper is a switch that sends a signal from the board to the wires to prevent a short in the wiring. When a short circuit occurs in some areas of the electrical system, the furnace can “shimmy” and become unbalanced, which can potentially destroy it.
The furnace does not necessarily need repair when its thermostat error jumper has been activated. All you have to do is remove refrigerant from the leaky connection on your old-fashioned heat-only type or disconnect/reconnect on an atypical oil burner/water heater type that has been set up with backup heating if necessary. Your furnace will resume normal operation once you’ve corrected this situation.