PRIMST Low-Temperature Room Air Conditioner · Fault Code Quick Reference

Select a fault code

Click a code to see the exact remedy · codes marked with tag have LED flash data.

Remedy

Cause → Corrective Action + Ordered on-site steps

How to use:There are two fault indicators on the outdoor main board — Red LED5 and Green LED6, During a fault theyflash alternately. First count the red flashes, then the green flashes, select the matching counts below, and you can identify the Fault code. (Example: red 9 flashes + green 3 flashes = 93 compressor stall)

Number of red LED5 flashes

Number of green LED6 flashes

When both are set to "Any", the table below lists all 17 codes that have LED flash data.

Lookup Result

LED flash cross-reference table

Can be used directly on site as a lookup reference.

Browse by fault category

total 0 items · each card shows that code's "Primary fix"; click to view the full remedy

Applies to codes:00 Wired controller communication fault · 03 Outdoor unit communication fault · 90 Compressor drive communication fault —— These three also have a quick-jump link at the bottom of their detail pages. All“indoor and outdoor units cannot communicate”communication troubleshooting can follow this flow.

Full Fault Code List

total 0 items · click a column header to sort, click a row to see the remedy.

How to use on site:When troubleshooting sensor-type faults (31/32/35/36/37/21/22/25/26/56, etc.), measure the sensorResistance → look it up herecorresponding temperature → with theactual temperature. A deviation of more than about 2℃ meansResistance drift, so the sensor should be replaced. You can also look up the standard resistance from a known temperature.

Sensor type

Lookup direction

Measured resistance R (kΩ)

⇄

Temperature T(℃)

Temperature–Resistance Reference Table

Full OEM parameter table; values between tabulated points are linearly interpolated.