Danby freezer shows E9 and may not defrost or may show erratic temperature swings.

Safety first: Unplug the freezer before accessing the evaporator or electrical components. Avoid contact with sharp evaporator fins.

Steps to address E9:

• Check for frost buildup: Remove the interior rear panel and inspect the evaporator. Heavy ice indicates a defrost failure.
• Test defrost heater: Disconnect the heater leads and measure resistance with a multimeter. Infinite resistance indicates an open heater that must be replaced.
• Inspect wiring: Look for burnt insulation, loose connectors, or signs of arcing along the heater wiring harness.
• Check for shorts: Measure resistance from each heater terminal to ground (metal chassis). A low resistance reading indicates a shorted heater or wire that must be replaced.
• Control board relay: If the heater and wiring test good, the defrost relay on the main control board may not be energizing. Replace the main control board if confirmed.
• Manual defrost: As a temporary measure, manually defrost the unit by unplugging and allowing ice to melt, then restart. This will not fix the underlying issue but can restore cooling briefly.

Note: Always match the replacement heater to the exact Danby model and wattage rating.