Due to their dependability and reasonable price point, RunTru furnaces (built by Trane) are another popular choice for Edmonton homeowners.
If you have a RunTru furnace in your home, it’s important to note that RunTru error codes, unlike many other furnace brands, are not conveyed with coloured or flashing lights. Instead, RunTru furnaces use alpha-numeric codes to convey issues.
Below are some of the most common RunTru furnace error codes and what they mean.
Please Note: Refer to your furnace’s user manual for the most accurate and brand-specific error code details.
| RunTru Furnace Error Code | Meaning | Potential Issue |
| E01 | Loss of the IRQ or other internal failure | Issue with the control board. The control board may need to be reset or replaced. |
| E2.1 | Retries exceeded (ignition error) | Gas valve issue, gas supply interruption, faulty igniter, or flame sensor problem (e.g., faulty or dirty sensor). |
| E2.2 | Recycles exceeded (flame sensed and lost, one hour lockout after 10 times) | Dirty or broken flame sensor, inconsistent gas flow, faulty wiring, etc. |
| E3.1 | Shorted pressure switch | Faulty pressure switch or wiring, venting problems/blockage in vent, etc. |
| E3.2 | Open pressure switch | Damaged or faulty pressure switch, cracked pressure switch hose, pressure switch hose blocked or improperly connected, loose wiring, etc. |
| E04 | Open thermal limit, rollout switch, or reverse airflow switch | Dirty/clogged filters, cracked or blocked heat exchanger, blocked vents, etc. |
| E05 | Flame detected when no flame should be present | Gas valve malfunction, dirty or defective flame sensor, slow closure, electrical fault, gas valve stuck open or closing too slowly, etc. |
| E6.1 | Voltage reversed polarity | Wiring issue. |
| E6.2 | Bad grounding | Issue with wiring. |
| E6.3 | (1) Igniter relay fails, or (2) igniter open | Faulty igniter or flame sensor, dirty filter, issue with gas line, etc. |
| E7.1 | Gas valve (MVL) energized when it should be off | Gas valve stuck open, dirty or damaged flame sensor, issues with wiring, etc. |
| E08 | Low flame current (still strong enough to allow operation) | Dirty or faulty flame sensor, low gas pressure, etc. |
| E09 | Open inducer limit switch or condensate pressure switch | Blocked condensate drain or vents, issue with pressure switch, etc. |
| E12 | Open fuse | Low airflow, issue with wiring, other faulty or worn furnace components. |