failure to energize the main gas valve after pilot ignition

leading to overheating in the zone despite the thermostat signal

reliable installations for field technicians

Designed with a forged brass body and a nickel-plated stem

Using this on a 2-pipe system may lead to bypass issues or improper condensate return

Lochinvar & A.O. Smith 100074696 Computer Board 322056-301 failure to energize the mainThe Lochinvar & A. O. Smith 100074696 Computer Board is a critical genuine OEM replacement part engineered for high efficiency tankless water heater control. Specifically utilized in Takagi T H3 DV and T H3 OS equivalent models, including the ATIO 540H series, this Computer Board 540 manages the modulation of the gas valve and fan speed to maintain precise discharge water temperatures. When troubleshooting water heater error codes such as the 101 or