a full HD44AR135 assembly is the most reliable fix

this fan control switch is engineered with a fixed temperature profile

This three-speed

Confirm the model number of your Lochinvar or A

The 18C-522-8-125 features a significantly larger 1" port and a much higher discharge capacity (over 3 million BTU/hr) compared to standard 3/4" residential valves

Mitsubishi Electric E27319307 Thermistor 322055-301 a full HD44AR135 assembly isThe Mitsubishi Electric E27319307 Thermistor is a critical replacement HVAC temperature sensor designed for precision monitoring in Mitsubishi mini split systems and industrial HVACR applications. As a genuine OEM Mitsubishi part, this thermistor ensures accurate resistance to temperature feedback, which is vital for the proper modulation of inverter driven compressors and electronic expansion valves. In the field, a drifting or open circuit