{"product_id":"refrigerator-dual-bulb-thermostat-4201260","title":"Refrigerator Dual Bulb Thermostat 4201260 — Restores Precise Temperature Control","description":"\u003cstyle\u003e\n.hero-banner{\nposition:relative;\noverflow:hidden;\nbackground:\nlinear-gradient(135deg,rgba(0,0,0,.86) 55%,rgba(0,0,0,.45)),\nurl('https:\/\/cdn.shopify.com\/s\/files\/1\/0897\/7783\/2225\/files\/4444444444444444.png?v=1777040489') center\/cover no-repeat;\npadding:44px 34px;\nborder-radius:12px;\nmargin:0 0 28px;\ncolor:#fff;\nbox-shadow:0 10px 30px rgba(0,0,0,.25);\n}\n.hero-banner:before{\ncontent:'';\nposition:absolute;\ninset:0;\nbackground:radial-gradient(circle at center,rgba(0,153,255,.20),transparent 65%);\nanimation:pulse 5s infinite;\n}\n.hero-banner\u003e*{position:relative;z-index:2;}\n.hero-banner h2{margin:0 0 8px;font-size:1.85em;font-weight:900;letter-spacing:.2px;line-height:1.1;}\n.label{display:inline-block;background:#c8a400;color:#000;font-size:.72em;font-weight:900;text-transform:uppercase;letter-spacing:1px;padding:5px 12px;border-radius:999px;margin-bottom:12px;}\n.hero-specs{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px;}\n.hero-specs span{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:7px 13px;font-size:.82em;font-weight:800;}\n.pro-tip{position:relative;overflow:hidden;background:#1a1a2e;border-left:5px solid #c8a400;padding:16px 20px;border-radius:8px;margin:24px 0;color:#f0f0f0;font-size:.95em;line-height:1.6;}\n.pro-tip strong{color:#c8a400;}\n.upsell-box{background:#ffecd1;border-left:5px solid #ff9800;padding:14px 18px;margin:20px 0;border-radius:8px;}\n@keyframes pulse{50%{opacity:.85}}\n\u003c\/style\u003e\n\u003cdiv class=\"hero-banner\"\u003e\n\u003cdiv class=\"label\"\u003eOEM REPLACEMENT PART\u003c\/div\u003e\n\u003ch2\u003eRefrigerator Temperature Off? Compressor Running Non-Stop?\u003c\/h2\u003e\n\u003cdiv class=\"hero-specs\"\u003e\n\u003cspan\u003ePart# 4201260\u003c\/span\u003e \u003cspan\u003eReplaces 4200930\u003c\/span\u003e \u003cspan\u003eFits Sub-Zero\u003c\/span\u003e \u003cspan\u003e500 Series\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch1\u003eRefrigerator Not Holding Temperature? Dual Bulb Thermostat 4201260 – Fix Erratic Cooling Fast\u003c\/h1\u003e\n\u003cp\u003e\u003cstrong\u003eIf your Sub-Zero refrigerator is running too warm, too cold, or the compressor won't stop cycling, the dual bulb thermostat is the most common cause.\u003c\/strong\u003e In Sub-Zero 500 Series refrigerators, this thermostat uses two sensing bulbs to monitor both the fresh food and freezer compartments simultaneously. When it fails, the system loses accurate temperature feedback — causing the compressor to over-run, under-run, or cycle erratically. \u003cstrong\u003e⚡ Common failure point in Sub-Zero 500 Series built refrigerators.\u003c\/strong\u003e \u003cstrong\u003ePart 4201260\u003c\/strong\u003e is the genuine OEM replacement that restores precise dual-zone temperature sensing and normal compressor cycling immediately.\u003c\/p\u003e\n\u003ch3\u003e❓ Is This the Right Part?\u003c\/h3\u003e\n\u003cp\u003eThis is the correct fix if ALL of the following are true:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e✔ You have a 500 Series refrigerator (501R, 511, 532, 542, 550, or 561)\u003c\/li\u003e\n\u003cli\u003e✔ For models 501R, 532, 542, 550, and 561 — your serial number is M821354 \/ P612141 or later (earlier serials require 4200930)\u003c\/li\u003e\n\u003cli\u003e✔ The refrigerator powers on and runs — compressor operates but temperature control is erratic\u003c\/li\u003e\n\u003cli\u003e✔ ONLY problem is inconsistent temperatures or compressor cycling — not a sealed system or evaporator failure\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNot sure? \u003ca href=\"\/pages\/contact\"\u003eSend us your model and serial number\u003c\/a\u003e — we'll confirm before you order.\u003c\/p\u003e\n\u003ch3\u003e🔧 Common Symptoms\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eRefrigerator compartment too warm — food spoiling faster than expected\u003c\/li\u003e\n\u003cli\u003eFreezer not holding temperature — partial thawing or frost buildup\u003c\/li\u003e\n\u003cli\u003eCompressor running constantly without cycling off\u003c\/li\u003e\n\u003cli\u003eErratic temperature swings — unit alternates between too cold and too warm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e✔ If these symptoms match, this is the most likely failed component in the system.\u003c\/p\u003e\n\u003cp\u003e✔ In most cases, replacing this dual bulb thermostat restores normal operation immediately.\u003c\/p\u003e\n\u003ch3\u003e📦 Part Details\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 4201260\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Dual Bulb Refrigerator Thermostat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces:\u003c\/strong\u003e 4200930 (applicable serial numbers), 7404P008-60\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrands:\u003c\/strong\u003e Sub-Zero\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"upsell-box\"\u003e\n\u003cstrong\u003e⚠️ Recommended While Servicing:\u003c\/strong\u003e\u003cbr\u003eWhile the thermostat panel is open, inspect the capillary tubes on both sensing bulbs for kinks or corrosion — damaged tubes cause the same symptoms as a failed thermostat and will not be resolved by the new part alone. If either tube shows damage, the thermostat assembly must be replaced as a complete unit regardless.\u003c\/div\u003e\n\u003ch3\u003e⚙️ Installation\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eSkill Level: Advanced — 45 to 90 minutes.\u003c\/strong\u003e Disconnect power to the unit before servicing. Access the thermostat by removing the interior control housing panel — location varies by model but is typically at the top rear of the fresh food compartment. Carefully route the two sensing bulbs into their original positions in the evaporator and fresh food zones, secure the thermostat body to the housing, reconnect the wiring harness, and restore power. Allow 24 hours for the unit to stabilize before evaluating temperature performance.\u003c\/p\u003e\n\u003ch3\u003e💡 Pro Tip\u003c\/h3\u003e\n\u003cdiv class=\"pro-tip\"\u003e\n\u003cstrong\u003eSerial Number Verification Is Critical on This Part:\u003c\/strong\u003e\u003cbr\u003eSub-Zero updated the thermostat specification mid-production on the 500 Series. Models 501R, 532, 542, 550, and 561 with serial numbers \u003cem\u003ebefore\u003c\/em\u003e M821354 \/ P612141 require part \u003cstrong\u003e4200930\u003c\/strong\u003e — not this part. Model 511 is compatible across all serial numbers. Installing the wrong thermostat will result in incorrect temperature calibration even if the unit appears to function. Always confirm your serial number plate (located on the interior left wall) before ordering.\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/sub-zero-501r-parts\"\u003e501R\u003c\/a\u003e, \u003ca href=\"\/pages\/sub-zero-511-parts\"\u003e511\u003c\/a\u003e, \u003ca href=\"\/pages\/sub-zero-532-parts\"\u003e532\u003c\/a\u003e, \u003ca href=\"\/pages\/sub-zero-542-parts\"\u003e542\u003c\/a\u003e, \u003ca href=\"\/pages\/sub-zero-550-parts\"\u003e550\u003c\/a\u003e, \u003ca href=\"\/pages\/sub-zero-561-parts\"\u003e561\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0897\/7783\/2225\/files\/4444444444444444.png?v=1777040489\" style=\"width: 600px; max-width: 100%; display: block; margin-top: 24px; border-radius: 10px;\" alt=\"4201260 – Sub-Zero Refrigerator Dual Bulb Thermostat Parts Diagram\"\u003e\u003c\/p\u003e\n\u003ch2\u003e✓ Model-Specific Repair Pages\u003c\/h2\u003e\n\u003cdiv class=\"model-link-grid\"\u003e\n  \u003ca href=\"\/pages\/kenmore-110-series-dryer-parts-whirlpool-built\" style=\"display:inline-block;border:1px solid #cc0000;border-radius:20px;padding:5px 14px;font-size:13px;color:#cc0000;text-decoration:none;margin:4px;\"\u003eGE SERIES Refrigerator Parts \u0026amp; Repair Guide\u003c\/a\u003e\n  \u003ca href=\"\/pages\/kitchenaid-refrigerator-parts-canada\" style=\"display:inline-block;border:1px solid #cc0000;border-radius:20px;padding:5px 14px;font-size:13px;color:#cc0000;text-decoration:none;margin:4px;\"\u003eREFRIGERATOR\u003c\/a\u003e\n\u003c\/div\u003e","brand":"Sub-Zero","offers":[{"title":"OEM","offer_id":51872499859745,"sku":"4201260","price":249.98,"currency_code":"CAD","in_stock":false},{"title":"Used","offer_id":51872499892513,"sku":"4201260","price":119.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0897\/7783\/2225\/files\/s-l640_11_2c2049d4-5adc-43bb-ab3e-0a72404c8902.png?v=1759350724","url":"https:\/\/xpartsupply.com\/products\/refrigerator-dual-bulb-thermostat-4201260","provider":"XPart Supply Ltd.","version":"1.0","type":"link"}