Has the changeover switch been turned to the hot air position? Is the cycle switch on the engine turned on? Is the thermostat normal? Has the water temperature increased? If the switch is switched to the heating position, the circulation switch has been turned on, the water temperature has reached the standard (the temperature is different with different settings of 60-80 thermostat), and the cold air is still blown out. Consider whether the pipeline is blocked. Find the return pipe connector of the water heater on the front cover. When the water temperature meets the requirements, pull out the connector after the flameout, and then start to see if there is water coming out of the return pipeline. If not, just clean the pipes. I have been touched once before, and the water tank treasure is scarce. I couldn't find the same brand, so I put some in the engine and added a new one, which may not be clean. I added two different water tanks before and after, and reacted by blocking the heating circulating pipe, removing it, threading it with iron wire, washing it with a high-pressure water gun, and then releasing all the water tanks in the engine, washing them with water and cleaning them thoroughly.
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