Indoor Thermistor Fault (Coil or Room)

What does 2-time blink 2.5-second OFF mean?

This indicates a short or open circuit in either the indoor coil thermistor or the room temperature thermistor. The fault affects the unit's ability to accurately monitor internal temperatures, potentially leading to issues like coil freezing, improper defrost cycles, or inaccurate temperature control. If left unaddressed, this can cause operational inefficiency and damage to the refrigeration system.

Complete Troubleshooting Guide

1. 1

   Refer to section 9-7 for the characteristics of the indoor coil and room temperature thermistors to obtain expected resistance values.

2. 2

   Measure the resistance of both the indoor coil and room temperature thermistors with a multimeter and compare to specifications.

3. 3

   Inspect all thermistor wiring and connectors for secure contact, corrosion, or physical damage.

4. 4

   Replace the specific indoor coil thermistor or room temperature thermistor found to be faulty.