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The T8400C and T8401C Thermostats provide single- stage, non-programmable temperature control for 24V heating-cooling systems with manual changeover Honeywell T8400C Manual Online: Troubleshooting. Refer to Fig. 21 for the T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS. POSSIBLE Honeywell's non-programmable digital thermostat is compatible with heat pumps. Easy to install Digital Non-Programmable Thermostat Installation Manual.Sounds like a manual limit needs to be reset (thermal disc). Generally the manual limits are around the exhaust - backdraft, or burner assembly I have a Honeywell T8400C 1024 (2) 0541 1A thermostat control that the display has This thermostat does not have a battery it gets it's power from the furnace or air My digital thermostat screen is blank but ac runs on manual on setting. Honeywell Electronic Thermostat Installation Instructions. TRADELINE T8400C Thermostat pdf manual download. Also for: T8401c, Tradeline t8401c. APPLICATION. The T8400C and T8401C Standard Electronic Thermostats for 24V heating-cooling systems with manual changeover . In CanadavHoneywell Limited/Honeywell Limitee, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. T8400 Honeywell Thermostats Series with manual changeover from heat to cool. T8400C1024 Honeywell - Non-Programmable thermostat, Electronic 1 Heat The T8400C and T8401C Thermostats provide single- stage, non-programmable temperature control for 24V heating-cooling systems with manual changeover