Ruud Control Board Lockup or Surge Damage

Furnace will not start after a power outage or brownout.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Integrated furnace control board latched in error state, Blown low-voltage fuse, Surge-damaged electronics

Safety: Turn off power before inspecting the control board.

Steps to check:

Power reset: Turn off the furnace breaker for 5–10 minutes, then restore power.
Check board LED: Observe the status LED for any error codes and troubleshoot accordingly.
Inspect fuse: Replace the low-voltage fuse on the board if blown.
Surge protection: Consider installing a surge protector for the furnace circuit to prevent future damage.

Medium 3/5

Integrated Furnace Control Board

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