Experiencing wild temperature swings that constantly go up and down indicates burner short-cycling, fluctuating water pressure, or flow sensor calibration errors. If water flow fluctuates due to pressure drops or low-flow fixtures, the tankless unit struggles to modulate gas burner output correctly. Furthermore, severe scale accumulation on the internal heat exchanger coils creates hot spots that trick safety sensors into shutting burners off prematurely, resulting in alternating bursts of hot and cold water. Verification: Remove flow-restrictive showerhead inserts and monitor temperature consistency.
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