中文
含义
1H 表示洗碗机主控板检测到加热回路故障，在洗涤或干燥阶段无法加热水温。通用电气洗碗机使用管状加热元件（CALROD）嵌入水槽底部，主控板通过继电器控制加热元件通电，并持续监测回路电流。当主控板发送加热指令后，电流检测电路未感应到预期的电流消耗（通常 6-10 A），系统判定加热回路断路，显示 1H 代码并跳过加热步骤以保护电路。若发生在干燥阶段，餐具将不会烘干；若发生在洗涤阶段，水温不足会导致洗涤效果大幅下降。
常见原因
- 加热元件本身烧断开路：长期使用后加热管内部电阻丝熔断，万用表测量两端电阻为无穷大（正常约 15-25 Ω），是最常见的 1H 故障原因。
- 加热元件接线端子因高温氧化或松动，接触电阻增大导致端子烧蚀、线耳熔断，形成物理断点。
- 主控板上加热继电器触点烧蚀或粘连：常开触点因频繁大电流通断产生电弧烧蚀，闭合时无法有效导通。
- 恒温器/温控器（通常为 145°F / 63°C 常闭型）内部双金属片失效永久断开，切断了加热回路供电。
- 主控板上电流检测互感器或采样电阻损坏，加热元件正常加热但主控板无法检测到电流信号。
- 加热回路线束在门铰链或水槽底部走线区域被磨损、挤压导致绝缘破损后对地短路，主控板触发过流保护停止加热。
自助排查
- 将洗碗机断电拔插头，等待 5 分钟让主控板完全放电复位，重新通电后启动一个短洗涤程序，观察故障代码是否清除。
- 断电后拆下洗碗机下前面板（踢脚板），目视检查水槽底部加热元件两端的接线端子：观察是否有烧焦变色、熔化的绝缘套或脱落的线耳。
- 如有万用表，断开加热元件任一端接线，测量元件两端电阻值：正常范围约 15-25 Ω（120V/1500W 加热器）。若显示 OL（无穷大），加热元件已烧断，需更换。
- 找到串联在加热回路中的恒温器（通常固定在加热元件附近），断电状态下测量其两端通断：常温下应导通（0 Ω）；若不通即为恒温器开路，需更换同规格恒温器。
- 检查加热元件表面是否有白色水垢厚层堆积：严重水垢会隔热导致元件内部过热烧断，清理水垢后若元件已断仍需更换。
- 若加热元件、恒温器、接线端子均正常但仍报 1H，故障大概率在主控板继电器或电流检测电路，需联系通用电气售后更换主控板。
English
Meaning
1H indicates that the dishwasher main control board has detected a fault in the heater circuit, preventing the water from being heated during the wash or dry phases. GE dishwashers use a tubular CALROD heating element embedded in the bottom of the tub; the control board energizes the element through a relay and continuously monitors the circuit current. When a heating command is issued but the current-sensing circuit does not detect the expected current draw (typically 6–10 A), the system determines the heater circuit is open, displays code 1H, and skips the heating step to protect the circuit. If this occurs during the dry phase, dishes will not dry; if during the wash phase, insufficient water temperature significantly degrades wash performance.
Common Causes
- The heating element itself has burned out and opened: after extended use, the internal resistance wire melts and breaks; a multimeter measurement across the terminals shows infinite resistance (normally approximately 15–25 Ω). This is the most common cause of code 1H.
- The heating element terminal connections have oxidized or loosened due to high temperature, causing increased contact resistance, terminal scorching, and wire lug melt-through, resulting in a physical break.
- The heating relay contacts on the main control board are pitted or welded: the normally-open contacts suffer arc erosion from frequent high-current switching and cannot effectively conduct when closed.
- The thermostat/thermal cutout (typically a 145°F / 63°C normally-closed type) has suffered internal bimetal disc failure and is permanently open, interrupting the heater circuit feed.
- The current-sensing transformer or shunt resistor on the main control board has failed; the heating element draws current normally but the control board cannot detect the current signal.
- The heater circuit wiring harness has been abraded or pinched in the door hinge area or along the tub bottom, causing insulation breakdown and a short to ground; the control board triggers over-current protection and stops heating.
Self-Check Steps
- Disconnect the dishwasher from power, wait 5 minutes for the main control board to fully discharge and reset, then restore power, start a short wash cycle, and observe whether the fault code clears.
- With power disconnected, remove the dishwasher’s lower front access panel (toe kick panel) and visually inspect the terminal connections at both ends of the heating element on the tub bottom: look for scorch marks, discoloration, melted insulation boots, or detached wire lugs.
- If you have a multimeter, disconnect one lead from the heating element and measure resistance across the element terminals: the normal range is approximately 15–25 Ω (for a 120V / 1500W heater). If the reading is OL (infinite), the heating element has burned out and requires replacement.
- Locate the thermostat wired in series with the heating element (typically mounted near the element), and with power disconnected measure continuity across its terminals: at room temperature it should read 0 Ω (closed); an open reading means the thermostat has failed and must be replaced with an identical-specification thermostat.
- Inspect the heating element surface for thick white scale buildup: severe scale acts as a thermal insulator, causing the element to overheat internally and burn out. After descaling, if the element is burned out it still requires replacement.
- If the heating element, thermostat, and terminal connections are all normal yet code 1H persists, the fault is most likely in the main control board relay or current-sensing circuit — contact GE after-sales service for control board replacement.