Lochinvar & A.O. Smith 100318326 Pressure Switch 318172-701 a 914-0036-03 capacitor should be

a 914-0036-03 capacitor should be tested with a multimeter on the MFD setting

The Allanson 421-661 Ignition Transformer is a high-performance Gordon Piatt replacement transformer designed for reliable spark ignition in demanding commercial burner applications

this ASCO RedHat valve ensures consistent 120Vac solenoid performance without the risk of premature seat failure common in lower-spec components

the internal diaphragm or solenoid coil has likely failed

Because the EA36YD057 is a hard shut-off TXV

Lochinvar & A.O. Smith 100318326 Pressure Switch 318172-701 a 914-0036-03 capacitor should beThe Lochinvar & A. O. Smith 100318326 Pressure Switch is a critical safety component designed for precise water pressure monitoring in high efficiency Noble Fire Combi Boilers and NKC series units. Engineering to detect low water pressure conditions, this switch acts as a primary fail safe, preventing dry fire scenarios and potential heat exchanger damage by ensuring the burner circuit remains open unless sufficient system pressure is established.