the internal contacts have likely failed and the switch requires replacement

Which gas valves are compatible with this kit

An "OL" or open reading indicates a failed coil that requires immediate replacement

this valve facilitates seamless refrigerant flow reversal to switch between heating and cooling modes

This valve is part of the ESBE/Danfoss rotary series

Belimo B252 Valve 318172-701 the internal contacts have likelyThe Belimo B252 is a high performance 2 way characterized control valve designed for precision in hydronics. Featuring a 2 inch NPT connection and a 85 Cv rating, this valve ensures linear heat output through its unique equal percentage flow characteristic. Engineered with a nickel plated forged brass body and a stainless steel ball and stem, it provides superior durability in demanding HVAC chilled and hot water systems. The integrated characterizing