Error Code 4 Flashes

Amana AMSS960803BN Error Code 4 Flashes: 4 Flashes

TL;DR

Primary or auxiliary limit circuit is open.

Disclaimer

This article is for informational purposes only and does not guarantee the accuracy or completeness of the information provided. Always turn off power and gas supply before attempting any repairs. If you smell gas, leave immediately and call your gas company. Consult a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

What Does Code 4 Flashes Mean?

Primary or auxiliary limit circuit is open.

Common Causes

Cause	Likelihood	DIY?
Faulty primary or auxiliary limit switch	Most common	✗ Call a pro →
Insufficient conditioned air over the heat exchanger	Common	✗ Call a pro →
Blocked filters, restrictive ductwork, improper circulator blower speed, or failed circulator blower	Common	✗ Call a pro →
Loose or improperly connected wiring	Uncommon	✗ Call a pro →

When to Call a Professional

Contact a licensed HVAC technician if:

Basic troubleshooting did not resolve the error
You smell gas at any point during the process
You are not comfortable working around gas lines or electrical components
The unit needs a gas valve, control board, or motor replacement

Sources

Service Instructions - GMSS9*/GCSS9*/AMSS9*/ACSS9* Single Stage Gas Furnaces and Accessories