Honeywell CT5OA,C; CT51A; CT53A Manual
Heating, Air Conditioning or Heating/Air Conditioning Thermostats
The CT50A is for most gas and oil heating-only systems.
The CTSOC is for most electric air condmoning-only systems.
The CTSlA is for most gas, oil, or electric healing/electric air conditioning systems
The CT53A is for millivoltage heating systems
Honeywell CT50A Heating Thermostat will replace most 15 to 30 V, 2-wire heating system thermostats. The CT50A is suitable only for gas or oil heating systems (NOT for air conditioning, heating/air conditioning, heat pump or electric heating systems). Your new CT5OC Cooling Thermostat will replace most 15 to 30 V, 3-wire air conditioning system thermostats (NOT for heating, heating/air conditioning or heat pump systems). Your new CT51 Heating/Cooling Thermostat will replace most 15 to 30 V, 4-wire. heating/ cooling system thermostats. The CT51A is suitable for gas, oil or electric heating/electric air conditioning systems (NOT for heat pumps). Your new CT53A Heating Thermostat is suitable for 250, 500 or 750 millivolt (mV) heating systems only.
Honeywell CT5OA,C; CT51A; CT53A Manual TROUBLESHOOTING
Your Honeywell thermostat requires little or no attention. Most problems can generally be traced to the following:
NOTE: If your system is heating-only or air conditioning-only, disregard sections not applicable to your system.
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