Amana AMVC960803BN Error Code None: No Power to Furnace

What Does Code None Mean?

On the AMVC960803BN, the Integrated Control Module drives a 3-character 7-segment LED display. During normal standby that display is lit and shows a status character, so a totally blank display tells you the board itself is not powered. Nothing else can run — no ignition sequence, no blower, and no diagnostic code — because the code system needs a live board to show anything.

Amana designed this furnace to need two supplies: 115V line power from your electrical panel and a 24V control voltage the onboard transformer derives from it. A tripped breaker, a blown fuse, a manual disconnect switch left off, or a front door panel that is not fully seated (it holds a door interlock switch) will all cut the board's power. Because the panel switch is a safety interlock, a panel that is even slightly ajar leaves the display dark exactly as if the breaker were off.

If line power is confirmed at the furnace and the panel is seated but the display stays dark, the fault has moved past the homeowner-serviceable items to the transformer or the Integrated Control Module itself. That is different from the EEE Internal Control Fault code, where the board has power and has detected its own internal failure — with a true no-power condition the board cannot report anything at all.

What You'll Notice

• The 7-segment LED display is completely blank with no glow or character
• The furnace does not respond at all to a call for heat from the thermostat
• A communicating ComfortNet thermostat may also go blank if it draws power from the furnace
• No blower, inducer, or ignition sounds when the thermostat is turned up
• The furnace breaker may be found tripped, or the disconnect switch found in the off position

Common Causes

How This Is Diagnosed

The problem is isolated from the outside in. First the homeowner-safe items are confirmed: breaker on, disconnect switch on, and the front panel fully seated against its interlock. If the display is still dark, a technician measures for 115V line voltage at the furnace and then for 24V at the control transformer output. If line voltage is present but 24V is missing, the transformer or its fuse is suspected; if 24V is present but the display is dead, the Integrated Control Module is replaced only after every upstream supply check passes.

How to Fix It: Restore Power to the Furnace

What You'll Need

• Flashlight

Steps

1. Turn off power at the breaker or furnace switch and shut off the gas supply Before touching the unit, switch the furnace breaker to OFF (or use the disconnect switch) and turn the manual gas shutoff valve near the furnace to the closed position (handle perpendicular to the pipe). If you smell gas at any time, leave immediately and call your gas company from outside.
2. Reset the circuit breaker or check the fuse At the electrical panel, find the furnace breaker. If it sits in the middle 'tripped' position, push it fully to OFF and then firmly back to ON. If your panel uses fuses, look for a blown fuse and replace it with one of the same rating.
3. Confirm the furnace disconnect switch is on Most installs have a dedicated switch that looks like a light switch on or beside the furnace. It is easy to bump off during cleaning or filter changes. Make sure it is in the ON position.
4. Fully seat the front door panel The AMVC960803BN has a door interlock switch that keeps the board dark whenever the blower-compartment panel is loose. Push the panel squarely into place until it is flush and you feel the interlock button depress.
5. Restore gas and power, then watch the display Open the gas valve (handle parallel to the pipe) and switch the breaker back ON. Within a few seconds the 7-segment display should light and show a status character. Then set the thermostat to call for heat and confirm a normal start.

When to Call a Professional

Contact a licensed HVAC technician if:

• The breaker trips again immediately after you reset it
• The disconnect switch and breaker are both on but the display stays dark
• The front panel is fully seated yet the display shows nothing
• There is a burning smell or visible scorching near the control board
• You are not certain the furnace is wired to a correct, dedicated circuit

✓ Verified against manufacturer service manual — March 2026