LG Oven Error Code H-4

The H-4 code means the LG oven's self-diagnostic system has detected an error in the lower broil heater circuit. The Wall Main PCB monitors this circuit and triggers the code when it receives an unexpected or absent signal from the heater. The fault can stem from a wiring connection issue at PCB terminals T206 or T207, a failed heating element, or less commonly, a defective control board.

It is not recommended to continue using the oven while the H-4 error is active. The code indicates a fault in the lower broil heater circuit, and operating the appliance with an unresolved electrical issue could pose a safety risk. The oven should be inspected and repaired before resuming normal use.

Repair costs vary depending on the root cause. If the fix is simply reseating a loose connector, there may be no parts cost, though a service call fee could apply if a technician performs the work. Replacing a lower broil heating element typically ranges from around $50 to $150 for parts, while a Wall Main PCB replacement can range from $100 to $300 or more for the part alone, plus labor costs if professionally serviced.

Some causes of the H-4 error are within reach of a knowledgeable DIYer. Checking and reseating the wire connections at terminals T206 and T207 on the Wall Main PCB requires no special tools and no parts. However, replacing a heating element or control board involves working with high-voltage components, so anyone uncomfortable with electrical repairs should contact a qualified appliance technician.

A power reset by unplugging the oven or switching off the circuit breaker may temporarily clear the H-4 code, but it will return if the underlying fault is not repaired. The error is generated by the self-diagnostic routine, so any remaining wiring fault, failed element, or board issue will trigger the code again on the next diagnostic cycle.