American Standard Furnace Error Codes
Complete list of American Standard furnace error codes with causes and how to fix them.
172
🔴
American Standard Furnace error code 172: Ignition lockout.
Technician Required
173
🔴
American Standard Furnace error code 173: Rollout switch lockout.
Technician Required
174
🔴
American Standard Furnace error code 174: Low pressure switch lockout.
Technician Required
175
🔴
American Standard Furnace error code 175: High pressure switch lockout.
Technician Required
177
🟡
American Standard Furnace error code 177: Limit switch open.
Technician Required
178
🟡
American Standard Furnace error code 178: Inducer motor fault.
Technician Required
179
🔴
American Standard Furnace error code 179: Flame sensor failure.
Technician Required
180
🟡
American Standard Furnace error code 180: Pressure switch open at start.
Technician Required
226
🔴
American Standard Furnace error code 226: Low gas pressure.
Technician Required
227
🔴
American Standard Furnace error code 227: High gas pressure.
Technician Required
E01
🟡
American Standard Furnace error code E01: Communication error.
Technician Required
E02
🟢
American Standard Furnace error code E02: Outdoor ambient sensor failure.
✓ DIY Possible
E03
🟢
American Standard Furnace error code E03: Outdoor coil sensor failure.
✓ DIY Possible
E04
🟢
American Standard Furnace error code E04: Discharge temperature sensor failure.
✓ DIY Possible
E05
🟢
American Standard Furnace error code E05: Suction temperature sensor failure.
✓ DIY Possible