Rheem Error Code A008: Exhaust Temperature High

Severity
Warning
Type
digital display
Where to look
front panel
Estimated repair cost: $100 — $250 (parts + labor)
Warning: Your Rheem HVAC system has detected an unusually high exhaust temperature, which could lead to system damage if not addressed.

How to Fix Rheem Code A008

  1. Check if the outdoor unit is clear of debris and has adequate airflow
  2. Inspect the exhaust vent for any blockages or obstructions
  3. If the problem persists, contact a professional HVAC technician

How to Reset Rheem Code A008

  1. Turn off the unit using the power button on the front panel.
  2. Turn off the gas supply valve.
  3. Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
  4. Restore power at the breaker, then open the gas valve.
  5. Turn the unit back on. If the error returns, the underlying issue needs repair.

What does A008 mean?

The A008 error code on your Rheem HVAC system indicates that the exhaust temperature has exceeded the safe limit. This could be due to a variety of reasons, including a faulty temperature sensor, a clogged exhaust vent, or a problem with the heat exchanger. It's important to address this issue promptly to prevent further damage to your system.

Affected Models

Replacement Parts

PartOEM NumberEst. Cost
Exhaust Temperature Sensor RHEEM 4413785 —
Exhaust Vent — —

Related Codes on Same Models

CodeDescriptionSeverity
A001 Ignition Failure Warning
A003 Abnormal Ignition Warning
A004 False Flame Detection Warning
A011 No Flame Detected Warning
A021 Over-Temperature Warning
A031 Inlet Thermistor Open/Short Warning
A041 Outlet Thermistor Open/Short Warning
A043 Water Level Error Warning
A051 Fan Motor Abnormality Warning
A052 Fan Motor Speed Error Warning