Amana AMSS960803BN Error Code No LED Signal: No 115 Volt Power / No 24 Volt Power
What Does Code No LED Signal Mean?
On the Amana AMSS960803BN, the Integrated Control Module uses a single diagnostic LED to report status. Any lit LED — steady on for normal operation, or a numbered flash pattern for a fault — tells you the board has power and is running its self-checks. When the LED shows no signal whatsoever, the board itself is not being powered, so the furnace cannot start the inducer, ignite, or run the blower.
This single-stage 96% furnace draws its 115-volt supply through the furnace circuit, a disconnect switch, and the blower-compartment door switch before reaching the module, which then produces its own 24-volt control power through the transformer. A break anywhere along that path leaves the LED dark. The most common cause is a tripped breaker or blown fuse at the electrical panel; the next is the furnace disconnect switch or the access-panel door switch being open. Because the manual notes that LED flash codes cease the instant power is interrupted through the disconnect or door switch, an unlatched panel looks exactly like a dead board.
Only after 115-volt and 24-volt power are confirmed at the module would Amana's onboard 3-amp fuse or an internal module fault be suspected — the least common cause. This state is distinct from the continuous/rapid flash (Reversed Polarity) code: with reversed polarity the LED still lights and flashes, whereas here there is no light at all.
What You'll Notice
- The furnace is completely dead and does nothing when the thermostat calls for heat
- The diagnostic LED seen through the access panel or sight glass shows no light at all
- No sounds from the unit — no inducer spin-up, no blower, no ignition attempt
- A thermostat powered from the furnace (using a C wire) may go blank or lose its display
Common Causes
How This Is Diagnosed
Because the LED is dark, the goal is to separate a power-supply problem from a board failure, working from the electrical supply inward. First the furnace circuit breaker is checked for a tripped state and any panel fuse for continuity, then the furnace disconnect switch is confirmed ON and the blower-compartment access panel is verified fully latched so its door switch closes. If power is confirmed reaching the furnace but the LED stays dark, a technician then measures 24 volts from the transformer and checks the module's onboard 3-amp fuse before concluding the Integrated Control Module has an internal fault, which is uncommon.
How to Fix It: Check the Circuit Breaker and Power Switches
What You'll Need
Steps
- Turn off power at the breaker and shut off the gas supply as a precaution Before investigating, switch off the furnace circuit breaker and turn the gas shutoff valve near the furnace to the OFF position (handle perpendicular to the pipe). If you smell gas at any point, leave immediately and call your gas company.
- Check the circuit breaker At your home's main electrical panel, find the breaker labeled for the furnace or HVAC system. If it sits in the middle (tripped) position, flip it fully to OFF and then back to ON. If your panel uses fuses, check whether the furnace fuse is blown and replace it with one of the same amperage.
- Check the furnace disconnect switch Look for a plain switch on or near the furnace — often on the side of the unit or on a nearby wall. Confirm it is ON. It looks like an ordinary room light switch and is easy to flip off by accident.
- Verify the access-panel door switch Make sure the blower-compartment access panel is fully seated and latched. The door switch cuts power whenever the panel is off or not completely closed. Press the panel firmly until it clicks into place.
- Restore gas and power, then verify Turn the gas valve back to ON (handle parallel to the pipe) and switch the breaker back on. Look at the control board through the access panel — the LED should now be steady on. Set the thermostat to call for heat and confirm the furnace starts.
When to Call a Professional
Contact a licensed HVAC technician if:
- The circuit breaker trips again immediately after you reset it
- The furnace switch is on and the breaker is not tripped, but the LED stays completely off
- The access panel is properly latched yet the furnace still shows no power
- You notice a burning smell, scorch marks, or other signs of electrical damage near the furnace
Frequently Asked Questions
Why is my Amana AMSS960803BN completely dead with no lights at all?
The Integrated Control Module is not receiving power. Most often this is a tripped breaker, a blown fuse, an open furnace disconnect switch, or an unlatched access panel that opens the door switch. Check those first, since any of them leaves the LED dark.
I reset the breaker but it trips again right away — what does that mean?
A breaker that trips instantly usually points to a short or a component drawing too much current. Stop resetting it and have a technician diagnose the circuit, because repeated resets on a faulted circuit can be hazardous.
The furnace switch is on but the LED is still off — is the control board bad?
Not necessarily. Confirm the breaker, the door switch, and the board's onboard 3-amp fuse first. An internal module fault is possible but uncommon compared with a simple interruption in the power supply.
Sources
✓ Verified against manufacturer service manual — March 2026