Twin error. The twinning feature is not working. The chart says to check the wiring connections, then replace the integrated control board.
Likely causes
- Twinning wiring connections
- Integrated control board
Safe checks for EEH
- Write down EEH. This code is about two furnaces twinned together, not a single-furnace heat call
- Techniciancheck the twinning wiring connections
- Technicianreplace the integrated control board if the wiring does not clear EEH
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. Twinning wiring and the control board are not a homeowner repair.
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Parts & tools for this fix
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Furnace control board and low-voltage fuse: guide
In this code: Integrated control board
This one is for a technician to test or replace, so we only explain it and do not link to buy it.