F.77 displayed, boiler may start then shut down, condensate may not drain

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

Blocked condensate pump or hoses, Failed condensate pump motor, Faulty condensate level switch, Blocked condensate trap

Safety: Isolate power. Condensate is mildly acidic; wear gloves and eye protection.

Steps:

Locate the condensate trap and pump assembly.
Check the condensate outlet pipe for kinks, blockages, or freezing (in cold weather).
Remove and clean the condensate trap of sludge and debris.
Inspect the pump and float switch for free movement; clean as necessary.

If the pump does not run when the level rises, it may need replacement by a technician.

Medium 3/5

Condensate Pump

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