---
title: There are no connections between the modules/devices and the controller, even though I have plugged them in.
description: "How to solve: There are no connections between the modules/devices and the controller, even though I have plugged them in."
---
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# There are no connections between the modules/devices and the controller, even though I have plugged them in.
Why is my TrolMaster device or sensor not connecting?
A failed TrolMaster device or sensor connection almost always traces back to a cable or connector issue — not a faulty controller. TrolMaster uses `RJ-12` hardwired cable connections with a straight-through configuration for all devices and sensors. Before assuming hardware failure, confirm the cable you are using matches this exact standard, then work through the steps below to isolate and resolve the problem.
How do I troubleshoot a TrolMaster connection problem?
1. Inspect the cables and Y-splitters for loose connections and any signs of moisture or corrosion on the pins.
2. Reseat all connectors by unplugging and firmly re-plugging each RJ-12 cable and Y-splitter. If any connector shows signs of corrosion or damage, replace it with a known-good straight-through RJ-12 cable before continuing.
3. Connect the module or device directly to the controller device port, bypassing any Y-splitters or extension cables.
- If the connection works when connected directly, the cable or Y-splitter is the likely cause.
- If the connection still fails when connected directly, the controller device port or the device itself may be faulty. Try a different device port on the controller if one is available. If the problem persists across all ports, or if the controller has only one device port, proceed to the warranty replacement steps below.
How do I request a warranty replacement?
If your TrolMaster device has no physical or water damage, you can request a warranty replacement by emailing [support@trolmaster.com](mailto:support@trolmaster.com) or [support@trolmaster.eu](mailto:support@trolmaster.eu). Verify the current warranty terms in your product documentation or by contacting TrolMaster support before submitting your request. Include the following in your email:
- The device serial number.
- A copy of the purchase invoice.
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- [Model One LED Bar (TLD-1, TLD-2, TLD-3, DR-1, FR-1)](https://kb.trolmaster.com/thinkgrow-led-lamps?hsLang=en#model-one-led-bar-tld-1-tld-2-tld-3-dr-1-fr-1)
- [Inner-Canopy LED Bar (ICL-120, ICL-150, ICL-300)](https://kb.trolmaster.com/thinkgrow-led-lamps?hsLang=en#inner-canopy-led-bar-icl-120-icl-150-icl-300)
- [Model-C Clone LED Light](https://kb.trolmaster.com/thinkgrow-led-lamps?hsLang=en#model-c-clone-led-light)
- [LED Light multibar (Model-H, Model-W, Model-V)](https://kb.trolmaster.com/thinkgrow-led-lamps?hsLang=en#led-light-multibar-model-h-model-w-model-v)
- [Aero-Fan Ventilation](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#main-content)
- [Smart Fan Remote (FRC-1, FRC-2)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#smart-fan-remote-frc-1-frc-2)
- [6" (150mm) Inline Duct Ventilation Fan (V-6)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#6-150mm-inline-duct-ventilation-fan-v-6)
- [8" (200mm) Inline Duct Ventilation Fan (V-8)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#8-200mm-inline-duct-ventilation-fan-v-8)
- [10" (250mm) Inline Duct Ventilation Fan (V-10)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#10-250mm-inline-duct-ventilation-fan-v-10)
- [12" (315mm) Inline Duct Ventilation Fan (V-12)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#12-315mm-inline-duct-ventilation-fan-v-12)
- [10" (250mm) Metall Inline Duct Ventilation Fan (V-10M)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#10-250mm-metall-inline-duct-ventilation-fan-v-10m)
- [12" (300mm) Metall Inline Duct Ventilation Fan (V-12M)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#12-300mm-metall-inline-duct-ventilation-fan-v-12m)
- [20" (500mm) High Velocity Fan (HE-20)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#20-500mm-high-velocity-fan-he-20)
- [20" (500mm) High Velocity Fan Pro Model (HE-20M)](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#20-500mm-high-velocity-fan-pro-model-he-20m)
- [Accessories](https://kb.trolmaster.com/aero-fan-ventilation?hsLang=en#accessories)
- [Climate Sensors and Medium Sensors](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#main-content)
- [4-in-1 Sensor Temp/Humid/CO2/Light on-off (MBS-PRO)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#4-in-1-sensor-temp-humid-co2-light-on-off-mbs-pro)
- [3-in-1 Temp/Humid/Light On/Off Sensor (MBS-TH)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#3-in-1-temp-humid-light-on-off-sensor-mbs-th)
- [Full Spectrum Quantum Sensor (MBS-PAR)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#full-spectrum-quantum-sensor-mbs-par)
- [3-in-1 Water Content Sensor (WCS-2)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#3-in-1-water-content-sensor-wcs-2)
- [Water Content Sensor 3 (WCS-3)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#water-content-sensor-3-wcs-3)
- [CO2 Sensor (MBS-S8)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#co2-sensor-mbs-s8)
- [CO2 Sensor for Carbon-X (MBS-K30)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#co2-sensor-for-carbon-x-mbs-k30)
- [Smoke Detector (MBS-SD)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#smoke-detector-mbs-sd)
- [4-in-1 Sensor for Green-X Controller (MBS-GH)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#4-in-1-sensor-for-green-x-controller-mbs-gh)
- [Weather Station Sensor (MBS-WS)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#weather-station-sensor-mbs-ws)
- [Weather Station Splitter (WSP-1)](https://kb.trolmaster.com/climate-sensors-and-medium-sensors?hsLang=en#weather-station-splitter-wsp-1)
- [Water and Nutrient Sensors](https://kb.trolmaster.com/water-and-nutrient-sensors?hsLang=en#main-content)
- [Inline/Reservoir EC/Temp Sensors (PCT-1, PCT-2, PCT-3)](https://kb.trolmaster.com/water-and-nutrient-sensors?hsLang=en#inline-reservoir-ec-temp-sensors-pct-1-pct-2-pct-3)
- [Inline/Reservoir pH Sensor (PPH-1, PPH-2, PPH-3)](https://kb.trolmaster.com/water-and-nutrient-sensors?hsLang=en#inline-reservoir-ph-sensor-pph-1-pph-2-pph-3)
- [Sensor Boards for pH and EC Sensors (AMP-2, AMP-3)](https://kb.trolmaster.com/water-and-nutrient-sensors?hsLang=en#sensor-boards-for-ph-and-ec-sensors-amp-2-amp-3)
- [Substrate Sensor Set for VWC, EC & Temp (WCS-9)](https://kb.trolmaster.com/water-and-nutrient-sensors?hsLang=en#substrate-sensor-set-for-vwc-ec-temp-wcs-9)
- [Substrate Sensor Node (WN-9)](https://kb.trolmaster.com/water-and-nutrient-sensors?hsLang=en#substrate-sensor-node-wn-9)
- [Water Detector (WD-1)](https://kb.trolmaster.com/water-and-nutrient-sensors?hsLang=en#water-detector-wd-1)
- [Device Stations and Adapters](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#main-content)
- [EC Fan Control Adapter (EFC-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#ec-fan-control-adapter-efc-1)
- [AC Remote Station (ARS-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#ac-remote-station-ars-1)
- [Temperature Device Station (DST-1, DST-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#temperature-device-station-dst-1-dst-2)
- [Thermostat Station (TS-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#thermostat-station-ts-1)
- [Thermostat Station (TS-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#thermostat-station-ts-2)
- [Reheat Station (TS-3)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#reheat-station-ts-3)
- [Humidity Device Station (DSH-1, DSH-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#humidity-device-station-dsh-1-dsh-2)
- [Humidistat Station (HS-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#humidistat-station-hs-1)
- [CO2 Device Station (DSC-1, DSC-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#co2-device-station-dsc-1-dsc-2)
- [Program Device Station (DSP-1, DSP-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#program-device-station-dsp-1-dsp-2)
- [Device Station Kit (4RS-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#device-station-kit-4rs-2)
- [Expander Station 4 (4RS-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#expander-station-4-4rs-1)
- [Dual Condition Adapters (DCC-1, DCC-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#dual-condition-adapters-dcc-1-dcc-2)
- [Dry Contact Board (OM-8)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#dry-contact-board-om-8)
- [Dry Contact Stations (DSD-1, DSD-2, DSD-3)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#dry-contact-stations-dsd-1-dsd-2-dsd-3)
- [Low-Volt Station (DSV-1, DSV-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#low-volt-station-dsv-1-dsv-2)
- [Motor Control Dry Contact Station (RMC-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#motor-control-dry-contact-station-rmc-1)
- [VFD Station for VFD Fan Speed Control (VFD-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#vfd-station-for-vfd-fan-speed-control-vfd-1)
- [Variable Frequency Drive for AC Motors Speed Controls (Delta-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#variable-frequency-drive-for-ac-motors-speed-controls-delta-1)
- [AC Remote Station (ARS-2)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#ac-remote-station-ars-2)
- [25Amps Relay Device Station (DSR-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#25amps-relay-device-station-dsr-1)
- [Single/Three Phase Curtain Motor Controller (AMC-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#single-three-phase-curtain-motor-controller-amc-1)
- [24V DC Greenhouse Roll Up Motor Controller (DMC-1)](https://kb.trolmaster.com/device-stations-and-adapters?hsLang=en#24v-dc-greenhouse-roll-up-motor-controller-dmc-1)
- [Control Boards and Flow Meters](https://kb.trolmaster.com/control-boards-and-flow-meters?hsLang=en#main-content)
- [6 Output 24V Control Board (OA6-24)](https://kb.trolmaster.com/control-boards-and-flow-meters?hsLang=en#6-output-24v-control-board-oa6-24)
- [6 Output 110V Control Board (OA6-110)](https://kb.trolmaster.com/control-boards-and-flow-meters?hsLang=en#6-output-110v-control-board-oa6-110)
- [12 Outputs 24V Control Board (OAT-24)](https://kb.trolmaster.com/control-boards-and-flow-meters?hsLang=en#12-outputs-24v-control-board-oat-24)
- [1" Digital Flow Meter (DFM-1)](https://kb.trolmaster.com/control-boards-and-flow-meters?hsLang=en#1-digital-flow-meter-dfm-1)
- [1.25" Digital Flow Meter (DFM-2)](https://kb.trolmaster.com/control-boards-and-flow-meters?hsLang=en#1-25-digital-flow-meter-dfm-2)
- [1.5" Digital Flow Meter (DFM-3)](https://kb.trolmaster.com/control-boards-and-flow-meters?hsLang=en#1-5-digital-flow-meter-dfm-3)
- [Lighting Control](https://kb.trolmaster.com/lighting-control?hsLang=en#main-content)
- [Light Adapter ThinkGrow (LMA-T)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-thinkgrow-lma-t)
- [Light Adapter Group Control (LMA-G)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-group-control-lma-g)
- [Light Adapter to Convert 0-10V Signals to Digital Signals to Control ThinkGrow LEDs (LMA-9)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-to-convert-0-10v-signals-to-digital-signals-to-control-thinkgrow-leds-lma-9)
- [Light Adapter 0-10V (LMA-14)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-0-10v-lma-14)
- [Group Control Adapter for 0-10V Protocol (LMA-14G)](https://kb.trolmaster.com/lighting-control?hsLang=en#group-control-adapter-for-0-10v-protocol-lma-14g)
- [Light Adapter Lantern Schedule (LMA-24)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-lantern-schedule-lma-24)
- [Light Adapter Phantom (LMA-11)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-phantom-lma-11)
- [Light Adapter Dimlux (LMA-12)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-dimlux-lma-12)
- [Light Adapter SunSystem (LMA-13)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-sunsystem-lma-13)
- [Light Adapter Dutch Lighting Innovations (LMA-15)](https://kb.trolmaster.com/lighting-control?hsLang=en#light-adapter-dutch-lighting-innovations-lma-15)
- [ThinkGrow Cable Management System](https://kb.trolmaster.com/thinkgrow-cable-management-system?hsLang=en#main-content)
- [Daisy Chain Power Cord System (DCA-10, DCA-12, DCA-14, DEA-10L, DEA-10, DEA-12, DEA-14)](https://kb.trolmaster.com/thinkgrow-cable-management-system?hsLang=en#daisy-chain-power-cord-system-dca-10-dca-12-dca-14-dea-10l-dea-10-dea-12-dea-14)
- [Cable Management Model One LED System (TDC-1, TDC-2, TDC-3, TDC-4, TDC-120, TDC-240, TDC-240E)](https://kb.trolmaster.com/thinkgrow-cable-management-system?hsLang=en#cable-management-model-one-led-system-tdc-1-tdc-2-tdc-3-tdc-4-tdc-120-tdc-240-tdc-240e)
- [Smart Junction Box (OPA-2)](https://kb.trolmaster.com/thinkgrow-cable-management-system?hsLang=en#smart-junction-box-opa-2)
- [ThinkGrow Accessoires](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#main-content)
- [Smart Light Lifter (LLT-1)](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#smart-light-lifter-llt-1)
- [Smart Light Lifter (LLT-2)](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#smart-light-lifter-llt-2)
- [Smart Light Lifter (LLT-3)](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#smart-light-lifter-llt-3)
- [Smart Lifter Remote (LRC-1)](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#smart-lifter-remote-lrc-1)
- [Vertical LED Stands for Inner-Canopy Lamps](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#vertical-led-stands-for-inner-canopy-lamps)
- [Lifter Rigging Cable Kit (RC-1)](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#lifter-rigging-cable-kit-rc-1)
- [Unitstrut Hanger for Model-H/H Plus/W/V (UH-1) and Model-I/I Plus (UH-2)](https://kb.trolmaster.com/thinkgrow-accessoires?hsLang=en#unitstrut-hanger-for-model-h-h-plus-w-v-uh-1-and-model-i-i-plus-uh-2)
- [Alarm Station](https://kb.trolmaster.com/alarm-station?hsLang=en#main-content)
- [CO2 Alarm Station (AS-1)](https://kb.trolmaster.com/alarm-station?hsLang=en#co2-alarm-station-as-1)
- [CO2 Alarm Station, mixed color (AS-2)](https://kb.trolmaster.com/alarm-station?hsLang=en#co2-alarm-station-mixed-color-as-2)
- [CO2 Alarm Station, orange (AS-3)](https://kb.trolmaster.com/alarm-station?hsLang=en#co2-alarm-station-orange-as-3)
- [CO2 Alarm Station, blue (AS-4)](https://kb.trolmaster.com/alarm-station?hsLang=en#co2-alarm-station-blue-as-4)
- [CO2 Alarm Siren (AS-5)](https://kb.trolmaster.com/alarm-station?hsLang=en#co2-alarm-siren-as-5)
- [Cables and Connections](https://kb.trolmaster.com/cables-and-connections?hsLang=en#main-content)
- [RJ12 Extension Cable Set (ECS-1)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#rj12-extension-cable-set-ecs-1)
- [RJ12 to 3 Pins IP67 Plug Cable Set (ECS-3)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#rj12-to-3-pins-ip67-plug-cable-set-ecs-3)
- [4,9m Extension Cable for AMP-2 Sensor Board (ECS-4)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#49m-extension-cable-for-amp-2-sensor-board-ecs-4)
- [RJ12 to PushLock Waterproof Connector Cable Set (ECS-5)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#rj12-to-pushlock-waterproof-connector-cable-set-ecs-5)
- [4,9m 4-Pin Extension Cable (ECS-6)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#49m-4-pin-extension-cable-ecs-6)
- [4-Pin 3,7m Daisy chain control cable (ECS-7)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#4-pin-37m-daisy-chain-control-cable-ecs-7)
- [9,8m Extension Cable for IR Emitter (ECS-8)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#98m-extension-cable-for-ir-emitter-ecs-8)
- [3,7m RJ12 to 4-Pin IP65 Connector Cable (ECS-9)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#37m-rj12-to-4-pin-ip65-connector-cable-ecs-9)
- [7,6m RJ12 Coiled Communication Cable (ECS-10)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#76m-rj12-coiled-communication-cable-ecs-10)
- [4-Pin Waterproof Splitter Cable (ECS-12)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#4-pin-waterproof-splitter-cable-ecs-12)
- [Touch Spot Extension Cable (TSS-2)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#touch-spot-extension-cable-tss-2)
- [150m RJ12 Cable Roll (ECS-500)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#150m-rj12-cable-roll-ecs-500)
- [Multifunction Crimper (MC-1)](https://kb.trolmaster.com/cables-and-connections?hsLang=en#multifunction-crimper-mc-1)
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- [RJ12 Splitter Hub (SPH-1)](https://kb.trolmaster.com/accessories?hsLang=en#rj12-splitter-hub-sph-1)
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- [RJ12 Waterproof Straight-Through Inline Coupler (2 Pieces) (ECW-1)](https://kb.trolmaster.com/accessories?hsLang=en#rj12-waterproof-straight-through-inline-coupler-2-pieces-ecw-1)
- [Sensor Bracket (2 Pieces) (TSB-1)](https://kb.trolmaster.com/accessories?hsLang=en#sensor-bracket-2-pieces-tsb-1)
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- [Cabinet (SCC-4)](https://kb.trolmaster.com/accessories?hsLang=en#cabinet-scc-4)
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