CodeRegistry
Brands
  1. Home
  2. Rheem
  3. Air Handlers
  4. 13
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

13

Fault code 13 — DC voltage detected abnormal

Rheem · Air Handlers

What does 13 mean?

The DC voltage within the system is abnormal. This can be caused by input voltage issues or a faulty control board.

Common Causes

  • Input voltage is too high or too low
  • Control board fails

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the input power supply voltage.

  2. 2

    If the voltage is within range, the main PCB may need to be replaced.

Browse all codes in this manual (51)
Verified technical data. Last updated: April 2026

Related Faults

1Fault code 1 — Inverter DC voltage overload fault10Fault code 10 — PFC fault (level)11Fault code 11 — PFC power detection of failure
Source: Rheem Air Handlers
Open Manual (Page 186)Search more codes in this manual