Gas Control Valve Voltage Tests - State Water Heaters SUF 119300 Service Handbook

GAS CONTROL VALVE ASSEMBLY: SUF 119300 - 119500 MODELS

GAS CONTROL VALVE VOLTAGE TESTS

1. The animated Gas Control Valve Status Icon is displayed on the Control System UIM during these
operating states. See "(UIM) User Interface Module Screen" Figure on Page 51. Check for 24 VAC
supplied to the 24 Volt Gas Control Valve at pins 11 and 12 of the J14 Plug on the CCB, see "CCB Cover
Removal And Replacement" on Page 46 and "CCB Circuit Board Layout" on Page 47. Using an
"AC" volt meter insert the two test probes into pins 11 and 12 of the J14 Plug on the CCB during the
Ignition Verification or Heating operating states, see Figure below. 24 VAC should be present. Note that
the Gas Control Valve Voltage is only present for a short period of time during the ignition period.
2. Check for 24 VDC at the plug end of the 24 Volt Gas Control Valve wiring harness during the Ignition
Verification operating state. Loosen the retaining screw for the 24 Volt Gas Control Valve wiring harness
plug and disconnect the plug, see "Gas Control Valve" on page 21. Lay the plug end upside down on
a flat surface. Using an "DC" volt meter insert the two test probes into the two outside plug sockets, see
Figure below. 24 VDC should be present.
AC VOLTAGE TEST
22
SUPPLY GAS
CONNECTION
Servicing should only be performed by a Qualified Service Technician
LOW GAS
PRESSURE
SWITCH
24 VAC SOLENOID
& WIRE HARNESS
DC VOLTAGE TEST