We had the same problem and found the internal flue had rusted through and were mixing the fumes with the fresh air, remove the top cover from the heat exchanger to check this, the flue is no longer available.
We had the same problem and found the internal flue had rusted through and were mixing the fumes with the fresh air, remove the top cover from the heat exchanger to check this, the flue is no longer available.
We had the same problem and found the internal flue had rusted through and were mixing the fumes with the fresh air, remove the top cover from the heat exchanger to check this, the flue is no longer available.
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