No communication with indoor unit error message

Old 11-17-18, 09:39 AM
sod is offline
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No communication with indoor unit error message

Bryant evolution 90i model 355AAV042060. Get a error message on the thermostat display to contact technican. Dismissed notice and everything returned to normal. 36 hours later I get same message and again dismissed message the furance runs fine and the thermostat returns to normal look.

I went into the thermostat diagnostics service menu and it showed a "No communication with indoor unit" error had been logged. Also I checked the error code display on the furance and it has solid amber and green lights but neither are blinking an error code.

Any idea what could be causing this intermittent problem and lack of communication? FYI tfhe furance is 13 years old. TIA

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