Error Code Continuous ON
Info

Carrier 58MVP Error Code Continuous ON: Normal Operation

TL;DR
Your furnace is in normal standby mode with the control board powered and ready. No action is needed.
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 Continuous ON Mean?

A continuous steady LED on the Carrier 58MVP means the control board has 24-volt power and is functioning normally. The furnace is simply waiting for your thermostat to send a signal requesting heat. This is the standard idle state you should see when no heating cycle is active.

The 58MVP's control board performs a self-check when powered on, and a steady LED confirms that it passed these checks and is ready to respond. You will see this status between heating cycles, during warmer weather when the thermostat is not calling for heat, and any time the system is in standby.

If your home feels cold despite seeing this steady LED, the issue is likely with the thermostat settings or wiring rather than the furnace itself. Verify your thermostat is set to heat mode, the setpoint is above the current room temperature, and the system switch is not in the off position.

Contact a licensed HVAC technician if any of these apply:

Sources

  1. 58MVP Series 170 Troubleshooting Guide

✓ Verified against manufacturer service manual — March 2026