E26 Return static pressure sensor out of range or not connected

What the control is telling you

The optional return static pressure kit (BAYFURNPTKT) reads out of range, or it is enabled but not plugged in. Furnace operation is not affected.

Applies to: Trane S8V2 only

Likely causes

• Kit enabled in app but not installed
• Harness unplugged
• Faulty transducer

Test and repair steps

1. Check whether BAYFURNPTKT is actually installed; if not, disable it in the Link mobile app (disabled is factory default).
2. If installed, confirm 5 VDC supply from the IFC and that the output voltage tracks the measured pressure.
3. Replace the transducer if the output does not follow pressure.

Settings for these units

Clearance to combustibles · Trane S8V2

24 in. front service access.

3 in. in front of the combustion air openings.

Return filter size by cabinet width · Trane S8V2

Filters are field supplied and mounted outside the cabinet.

Over 1600 CFM upflow: return on both sides, one side plus bottom, or bottom only.

Models that show this code

12 models in Trane S8V2

Other codes on the same units

• E13 Blower motor size / OEM ID mismatch
• E14 Configuration file error
• E17 Blower motor communication error
• E23 Menu data not received by combustion micro (CCM)
• E24 Internal communication error between ACM and CCM
• E25 Orientation sensor out of range
• E27 Return air thermistor out of range or not connected
• E28 Supply air thermistor out of range or not connected