Had the same problem with mud dauber wasps filling up the exhaust pipe. The furnace would shut down on its safeties. Took the outside trim piece off, broke up the mud with a long screwdriver while I held a shop vacuum nozzle next to the hole to suck out the dried mud.
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Larrie
Read detailed trip reports, see photos and videos on my travel blog, luinil.com.
Current van: 2002 Ford E350 extended body camper with Colorado Camper Van pop top and Agile Offroad 4WD conversion.
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