Thermostat with Power Modules (TH115-AF-12VDC / CT230 series)
This support page provides publications, manuals, videos, support articles, and common support questions for the Master Thermostat product line.
Main Products (6)
Common Support Questions (20)
Publications and Manuals (7)
Videos (3)
Articles (3)
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Main Products
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Common Support Questions
The breaker and wire sizes are selected based on the total amperage of the WarmlyYours heating system connected to a single thermostat. This information is on the WarmlyYours heating system's installation plan, electrical plan, or UL label. Based on guidelines from the National Electrical Code: loads up to 16 Amps may utilize 12 gauge wire with a 20-Amp breaker, and loads up to 12 Amps - 14 gauge wire with a 15-Amp breaker. Local code and/or other factors may change these guidelines.
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One thermostat can control multiple heating mats/cables as long as all the heating elements are using less than 15 amps:
TempZone™ will cover aprx. 120 sq. ft. for 120V systems and 240 sq. ft. for 240V systems on one thermostat.
Environ™ will cover aprx. 150 sq. ft. for 120V systems and 300 sq. ft. for 240V systems on one thermostat.
Slab Heat will cover aprx. 90 sq. ft. for 120V systems and 180 sq. ft. for 240V systems on one thermostat.
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When the ground fault protection mechanism trips, the TEST light is On (red). To reset the ground fault protection, switch the thermostat to Off and back to On. The TEST light will turn off.
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If your thermostat is blank, the first thing to do is to test to see if voltage is present at the rear of the thermostat. Verify that the power module power switches are in the ON position. Test for 12VDC across the 12VDC screw and the GROUND screw at the back of the thermostat. Here is a wiring diagram: https://www.warmlyyours.com/en-US/publications/MASTER-THERMOSTAT-W-POWER-MODULES-WIRING-DIAGRAM-B.pdf
If no power is reaching the thermostat, please test for 12VDC across the 12VDC and GND output at the front of power module base that is supplying power to the thermostat (the faceplate must be installed). If no power is present there, please inspect the circuit breaker in the breaker panel powering the power modules, and verify that the breaker is a non-GFCI type. If it is a GFCI breaker, replace it with a non-GFCI breaker. If there is power entering the thermostat and it is blank, it will need to be replaced. If power is getting to the power module and there is no 12VDC output to thermostat, the power module will need to be replaced.
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All thermostats are mandated at 42" height for handicap accessibility, most private residences are mounted at 52-60".
Please see this video on how to install a WarmlyYours nSpiration Series thermostat.
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No. The Honeywell CT230 must be controlled by a Honeywell Master Thermostat.
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No, the RC-40AMP is controlled by a line voltage (120V/240V) thermostat.
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Turn the power (circuit breaker typically) to the thermostat off for 5 minutes and then back on to reset the thermostat.
If there is power to the thermostat and it still doesn't appear to work, then the next step toward a solution is to take Ohm measurements of the floor heating system.
This is done with a digital multi-meter that can select a low 200 Ohm (Ω) scale. To conduct this test, turn off the circuit breaker. Remove the thermostat completely from the wall and disconnect the wires connected to the LOAD connections at the back of the thermostat. Disconnect the ground wires from the house ground, and do the test shown on the links below. If you are uncomfortable doing this test, contact a qualified electrician.
Please follow one of these guides based on the type of heating system installed:
For a quick overview of the testing process:
Here is a video showing how the test is done
Here is a video showing how to locate and identify the floor heating wires
If the system still does not function, contact +1 (800) 875-5285 WarmlyYours Technical Support and provide the Ohm measurements for further assistance.
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The Master Thermostat must operate on 12 VDC and is powered by one of the linked CT230 units.
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Up to ten (10) CT230 linked units can be used in a given system.
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Three (3) wires; Ground, Drive, and 12 Volt DC.
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Two (2) wires; just the ground and the drive wires.
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The manufacturer reversed the wiring pattern between the LOAD side and the LINE side on newly minted controllers, verify that your wiring matches the new wiring schematic stamped on the backplate of the new controller.
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No. The nJoin power module is not compatible with a Honeywell system.
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To reset the ground fault protection, switch the CT230 OFF and back ON, or cycle the circuit breaker off and on. The TEST light will turn off if the ground fault protection is functioning properly. If the TEST light comes back on, contact Warmly Yours at 1-800-875-5285 and speak to a technical support representative to help further troubleshoot your system.
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The wire distance between the master thermostat and each CT230 unit must not exceed 500 ft. (150 m). 20-AWG wires are recommended.
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The ground wire in the floor mat must be connected directly to the ground wire of the supply or to the house ground wire.
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The Master Thermostat.
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The flashing digits indicate that the actual (measured) floor temperature exceeds the thermostat temperature limit.
The temperature limit is set for either tile (104°F/40°C) or laminate (82°F/28°C) when the thermostat is first set up or re-configured.
For example: When the floor type (protection) is set to laminate, the limit defaults to 82°F/28°C. If the floor temperature goes above this - whether due to radiant floor heating or external heating sources, then the digits will flash and the heating is switched off.
Turning the temperature up or down will not affect the flashing digits. And leaving the thermostat alone with flashing digits does not harm the system.
Tip: To turn off the heated floor (ex. for months when it is not needed), on the outer edge of the thermostat, depress the lower right side button for 3-5 seconds. This will also turn it back on.
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Publications and Manuals
Installation
CT230 Power Module Installation Guide (English, French, Spanish)Retro-Fit Kit Installation Guide (English)
Technical Specifications
Diagram for converting TH115-12VDC (CT230) setup to nSpiration Thermostat with nJoin (English)Wiring Diagrams
Master Thermostat with Dual Voltage Power Modules Wiring Diagram (English)Master Thermostat with Dual Voltage Power Modules Wiring Diagram and Instructions (English)
SmartStat TH115 to TempZone Flex Wiring Diagram (English)
