{"product_id":"printhead-thermistor-for-epson-et-8550-xp-600-fix-error-code-031004-overheat-temperature-sensor","title":"Printhead Temperature Sensor (Thermistor) for Epson ET-8550 \u0026 XP-600 – Fix Error 031004 ET8550 XP600 THM","description":"\u003cp\u003eThis thermistor serves as a temperature sensor inside the printhead. When it begins to fail or provide inaccurate readings, the printer can no longer detect temperature correctly.\u003cbr\u003e\n\u003cbr\u003e\nAs a result, the printer may:\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eFalsely detect an overheating condition and shut down as a safety precaution, or\u003c\/li\u003e\n\t\u003cli\u003ePower on but display Error Code 031004, sometimes acting as if the printhead is not installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eIn most cases, Error 031004 indicates that the printer cannot read a valid temperature signal from the printhead thermistor. However, this error is not always caused by the thermistor alone. It may also be triggered by a damaged FFC cable or a faulty mainboard, so proper diagnosis is essential before replacing parts.\u003cbr\u003e\n\u003cbr\u003e\nThis replacement thermistor is compatible with both Epson ET-8550 and XP-600 printheads, making it a reliable solution for restoring normal printer operation.\u003cbr\u003e\n\u003cbr\u003e\n🔧 Common Symptoms\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eError code 031004\u003c\/li\u003e\n\t\u003cli\u003ePrinter shuts down during startup\u003c\/li\u003e\n\t\u003cli\u003eFalse overheating warnings\u003c\/li\u003e\n\t\u003cli\u003ePrinter fails to initialize or recognize the printhead\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cbr\u003e\n⚠️ Before Replacing the Thermistor\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eTo avoid unnecessary repairs, check the following:\u003c\/li\u003e\n\t\u003cli\u003eInspect printhead FFC cables for ink\/solution leakage, corrosion, or discoloration\u003c\/li\u003e\n\t\u003cli\u003eEnsure all FFC cables are fully inserted and securely connected\u003c\/li\u003e\n\t\u003cli\u003eTest with a known good printhead to confirm the mainboard is functioning properly\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cbr\u003e\n✅ What This Fix Does\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eRestores accurate temperature readings\u003c\/li\u003e\n\t\u003cli\u003ePrevents false overheating shutdowns\u003c\/li\u003e\n\t\u003cli\u003eHelps the printer properly detect and initialize the printhead\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cbr\u003e\n📦 What's Included\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003e1 × Thermistor (Temperature Sensor)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cbr\u003e\n⚠️ Installation Notes (Advanced Repair)\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eRequires printer disassembly and micro-soldering skills\u003c\/li\u003e\n\t\u003cli\u003eNot recommended for beginners\u003c\/li\u003e\n\t\u003cli\u003eBasic Steps Overview:\u003c\/li\u003e\n\t\u003cli\u003eRemove the printhead and unscrew the 4 screws to access the core\u003c\/li\u003e\n\t\u003cli\u003eLocate and desolder the faulty thermistor\u003c\/li\u003e\n\t\u003cli\u003eCarefully solder the replacement thermistor in place\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cbr\u003e\n💡 Compatibility\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eEpson ET-8550 printhead\u003c\/li\u003e\n\t\u003cli\u003eEpson XP-600 printheada (including DTF and modified setups)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cbr\u003e\n🛠️ Important Note\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003eError 031004 can have multiple causes. While the thermistor is a common failure point, issues with the FFC cables, mainboard, or power circuitry may produce the same error. This part is intended for diagnostic and repair use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cbr\u003e\n🔄 BCH Technologies Insight\u003c\/p\u003e\n\n\u003cul\u003e\n\t\u003cli\u003ePrinters operate as complete systems. Replacing a single component may not fully resolve the issue if other parts are compromised. A full inspection is recommended for long-term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n","brand":"BCH Technologies","offers":[{"title":"Default Title","offer_id":53141093286195,"sku":"AS-ET8550XP600-THM","price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0751\/5648\/8499\/files\/fb1d026a-9a00-594c-bf97-bf8da11f5d5c.jpg?v=1773775430","url":"https:\/\/bchtechnologies.com\/products\/printhead-thermistor-for-epson-et-8550-xp-600-fix-error-code-031004-overheat-temperature-sensor","provider":"BCH Technologies","version":"1.0","type":"link"}