{"product_id":"erp-replacement-wall-thermostat-9204h","title":"HVAC Heat-Only Wall Thermostat Horizontal for White-Rodgers Lux 9204H ERP","description":"\u003ch2\u003eHVAC Heat-Only Wall Thermostat\u003c\/h2\u003e\u003cp\u003eHorizontal mechanical room thermostat for single-stage gas or electric heating systems. Heat-only SPST control; 24VAC, 2 A maximum; 50–90°F dial range. Manufacturer also lists millivolt compatibility with the required anticipator setup. Not a line-voltage baseboard thermostat. Match the system and wiring to the installation manual.\u003c\/p\u003e\u003ch3\u003ePart identification\u003c\/h3\u003e\u003cul\u003e \u003cli\u003eCatalog vendor: ERP\u003c\/li\u003e \u003cli\u003ePart number: 9204H\u003c\/li\u003e \u003cli\u003eCompatible brands or component references: White-Rodgers; Lux\u003c\/li\u003e \u003c\/ul\u003e\u003ch3\u003eCross-reference part numbers\u003c\/h3\u003e\u003cp\u003e1C20-101, 1C20-102, PSM200, PSM90, 255-401, 255-40A\u003c\/p\u003e\u003cp\u003eBrand names identify compatible applications or referenced components; no genuine-OEM manufacture claim is made. Match the original part, full equipment model and configuration before ordering.\u003c\/p\u003e\u003ch3\u003eDiagnosis\u003c\/h3\u003e\u003cp\u003eTemperature-control or heat-call problems require diagnosis of the thermostat, wiring and heating system before replacement.\u003c\/p\u003e\u003ch3\u003eInstallation guidance\u003c\/h3\u003e\u003cp\u003eDisconnect HVAC control power before service. Confirm this heat-only low-voltage thermostat matches the system; never connect it to a line-voltage circuit. Follow the manufacturer's terminal diagram and anticipator instructions for the exact application. Do not jumper across gas-valve or system-control terminals to test. Use a qualified technician if wiring or system compatibility is uncertain.\u003c\/p\u003e\u003cp\u003eThis is preparation guidance, not a complete model-specific repair procedure.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.robertshaw.com\/wp-content\/uploads\/2026\/04\/352-00300-001_9200-and-9204-Robertshaw-Mechanical-Thermostat-Install-Manual.pdf\"\u003eManufacturer document for qualified service\u003c\/a\u003e — confirm document scope and control revision.\u003c\/p\u003e\u003cp\u003e\u003ca href=\"https:\/\/www.robertshaw.com\/parts\/wall-thermostats\/9200-series-mechanical-thermostats\/9204h\/\"\u003eProduct\/application reference 1\u003c\/a\u003e\u003c\/p\u003e","brand":"ERP","offers":[{"title":"Default Title","offer_id":50280611348723,"sku":"ER9204H","price":38.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0774\/7859\/2755\/files\/9204H-robertshaw.jpg?v=1788462668","url":"https:\/\/authenticapplianceparts.com\/products\/erp-replacement-wall-thermostat-9204h","provider":"Authentic Appliance Parts","version":"1.0","type":"link"}