CodeRegistry
Brands
  1. Home
  2. Rheem
  3. Air Conditioning
  4. A108
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.

A108

A108 - Condensate blocked: Unclog line

Rheem · Air Conditioning

What does A108 mean?

The condensate drain line is blocked, preventing water from draining. This can cause the unit to stop heating and rely on electric elements.

Common Causes

  • Blocked condensate drain line
  • Excessive condensate in the pan

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Remove the top cover of the water heater.

  2. 2

    Check the condensate line and pan for blockages or standing water.

  3. 3

    Clear any obstructions found in the drain line or pan.

  4. 4

    If the pan is dry and there's no blockage, the condensate sensor might need replacement.

Browse all codes in this manual (48)
Verified technical data. Last updated: April 2026

Related Faults

1 beep1 beep - WiFi Soft Reset initiated3 beeps3 beeps - WiFi Hard Reset initiated3 red flashes3 red flashes — Communication error
Source: Rheem Air Conditioning
Open Manual (Page 32)Search more codes in this manual