{"product_id":"johnson-controls-a421gbf-02c-temperature-controller","title":"Johnson Controls A421GBF-02C Single Stage Digital Temperature Control (24V, SPDT) Temperature Controller","description":"\u003cp\u003eThe \u003cstrong\u003eJohnson Controls A421GBF-02C Single Stage Digital Temperature Control (24V, SPDT) Temperature Controller\u003c\/strong\u003e is a Johnson Controls temperature controller for HVAC repair and replacement work. Use it when the part number \u003cstrong\u003eA421GBF-02C\u003c\/strong\u003e and the listed specifications match the equipment being serviced.\u003c\/p\u003e\n\u003cp\u003eElectronic Single Stage Temperature Control, 24 VAC, UL TYPE 1, IP20, 100VA, 24 VAC Class 2, 2M (6'-6\") Temperature Sensor\u003c\/p\u003e\n\u003ch3\u003eKey Specs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Temperature Control\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 24V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Temperature Control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplacement Notes\u003c\/h3\u003e\u003cp\u003eCaptured replacement references include A419GBF-1C, A99BB-200C. Confirm supersession details against the manufacturer parts list.\u003c\/p\u003e\n\u003ch3\u003eExpert Verdict\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eReviewed by the SuperArbor Pro Desk:\u003c\/strong\u003e choose this part when the existing component label and unit documentation match A421GBF-02C and the spec set above. It is best suited for targeted HVAC service repairs where exact fitment matters more than broad universal compatibility.\u003c\/p\u003e\n\u003ch3\u003eFAQs\u003c\/h3\u003e\u003ch4\u003eWhat is the Johnson Controls A421GBF-02C used for?\u003c\/h4\u003e\u003cp\u003eIt is a temperature controller for compatible Johnson Controls HVAC equipment. Match the part number A421GBF-02C and the equipment service literature before ordering or installing.\u003c\/p\u003e\u003ch4\u003eWhich specs should I verify before purchase?\u003c\/h4\u003e\u003cp\u003eVerify the spec set shown for this part: Product Type: Temperature Control; Voltage: 24V; Application: Temperature Control. The replacement should match the existing component and the unit documentation.\u003c\/p\u003e\u003ch4\u003eDoes the electrical rating need to match exactly?\u003c\/h4\u003e\u003cp\u003eYes. Confirm voltage rating 24V against the failed component label. Do not substitute a different rating unless the equipment manufacturer allows it.\u003c\/p\u003e\u003ch4\u003eAre replacement or superseded references available?\u003c\/h4\u003e\u003cp\u003eCaptured cross-reference data includes A419GBF-1C, A99BB-200C. Verify any supersession directly against the manufacturer parts list before installation.\u003c\/p\u003e\u003ch4\u003eWho should install this HVAC component?\u003c\/h4\u003e\u003cp\u003eA qualified HVAC technician should install and test the temperature controller. Disconnect power first, follow lockout procedures, and confirm safe operation after replacement.\u003c\/p\u003e\n\n\u003ch3\u003eSafety and Installation Notes\u003c\/h3\u003e\n\u003cp\u003eDisconnect power before service. HVAC electrical and combustion-related components should be installed and tested by a qualified technician. After installation, confirm wiring, mounting, airflow or fluid routing as applicable, and normal system operation.\u003c\/p\u003e","brand":"Johnson Controls","offers":[{"title":"Default Title","offer_id":53096109572463,"sku":"A421GBF-02C","price":111.36,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0830\/3499\/7051\/files\/a421gbf-02c-1.jpg?v=1780987550","url":"https:\/\/superarbor.io\/products\/johnson-controls-a421gbf-02c-temperature-controller","provider":"Super Arbor","version":"1.0","type":"link"}