Goodman GMVC960803BN Error Code E13: Redundant Relay Stuck Closed

What Does Code E13 Mean?

E13 on the Goodman GMVC960803BN means the redundant gas valve relay on the integrated control module is stuck in the closed (energized) position when it should be open. This is a critical safety fault: the redundant relay is part of the gas valve shutoff circuit, and if it cannot open, the furnace loses an essential layer of protection against uncontrolled gas flow.

The control module continuously monitors both the primary and redundant gas valve relays. When the redundant relay cannot open — typically because its contacts have welded together from overcurrent, heat, or age — the module detects the discrepancy and shuts the furnace down to prevent unsafe operation. The furnace will not run in this state.

E13 is the opposite of E12: E12 is the redundant relay stuck open when it should be closed, which only prevents firing, while E13 is that relay stuck closed when it should be open, meaning the safety shutoff path is compromised. Because a stuck-closed relay may keep the gas valve circuit energized even when the furnace is commanded off, turn off the gas supply at the shutoff valve. The integrated control module must be replaced by a qualified technician; do not reset or operate the furnace until service is complete.

What You'll Notice

• The furnace has shut down on a critical safety lockout and will not operate
• The 7-segment display shows E13
• The lockout is tied to the gas valve safety circuit rather than airflow or ignition
• The fault persists across power resets

Common Causes

How This Is Diagnosed

With the gas supply shut off, a technician verifies that the redundant gas valve relay on the integrated control module has welded or stuck closed and cannot open to interrupt the gas valve circuit. Because the relay is integral to the board, the control module is replaced once the stuck-closed condition is confirmed.

When to Call a Professional

This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:

• E13 is present — the gas supply valve should be shut off and a technician called immediately, without resetting or operating the furnace
• Control board replacement is required to replace the stuck relay, which must be done by a qualified HVAC technician
• The fault persists after a power reset, confirming a hardware failure on the board rather than a transient

✓ Verified against manufacturer service manual — March 2026