Gas-valve relay fault, or 24 VAC at the 2nd stage valve: the control reports failed internal gas-valve relays, or voltage sensed at the 2nd stage gas valve.
Likely causes
- Internal gas-valve relays have failed
- 24 VAC sensed at the 2nd stage gas valve
Safe checks for E11
- Do not jumper the gas valve. If you smell gas, leave and call the gas supplier from outside
- Technicianremove any heating call. If about 24 VAC is present between the brown lead at the gas valve and chassis ground, correct the wiring. If it is not present, replace the integrated furnace control
Capacitors can hold a charge after the power is off. Safety terms.
When to call a pro
Call a licensed HVAC technician. E11 is a gas-valve circuit fault. It is not the open-fuse code E12.
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Parts & tools for this fix
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Furnace control board and low-voltage fuse: guide
In this code: Parts list for this code: Integrated furnace control
This one is for a technician to test or replace, so we only explain it and do not link to buy it.