Amana AMVC960803BN Error Code EC1: Network Communication Alarm
What Does Code EC1 Mean?
Error code EC1 on the Amana AMVC960803BN indicates that the integrated control module has lost communication with the ComfortNet network. ComfortNet is Amana's proprietary communication protocol used between compatible thermostats, furnaces, and air conditioning equipment to enable smart system control, diagnostics, and coordinated operation.
When ComfortNet communication is lost, the furnace may continue to operate in a conventional thermostat fallback mode — responding to basic heat/cool calls from the R and W terminals — but advanced features such as variable-speed blower control through the thermostat, remote diagnostics, and coordinated system operation will not function. The type of fault and the severity of the impact depend on the system configuration.
A technician will check the ComfortNet wiring between the thermostat and the furnace, verify that the thermostat is powered and operating, inspect for any damaged or loose wiring at the communication terminals, and confirm that the ComfortNet network is properly configured. In some cases, the furnace control board or the ComfortNet thermostat may need replacement.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Lost communication with ComfortNet thermostat or network | Most common | ✗ Call a pro → |
| Wiring issue between furnace and thermostat | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- EC1 is present and the furnace is not heating at all — a technician must determine whether the furnace has lost all thermostat communication or only ComfortNet-specific communication
- ComfortNet wiring and thermostat have been inspected but EC1 persists — the control board or thermostat may require replacement
Sources
✓ Verified against manufacturer service manual — March 2026