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1.
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Do not operate the water pump with the water heater fluid level in the heater condenser tank lowered to the "L" line or below. If it is operated, the bearing of the water pump is damaged, and the water pump may be broken or the service life may be shortened..
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Check that the water heater fluid level in the heater condenser tank stays a range between the "F" line and "L" line.
2.Check that the water heater fluid is not contaminated with an oil or others.
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