Bradford White IGI-180R-10N - Manual (Page 41)

9) Is the change over solenoid (SV3) operating normally?
41
If error “11” or “71” is displayed, check the change over
solenoid (SV3).
a. # Disconnect the changeover solenoid (SV3)
connector, and measure the resistance at the
solenoid terminals.
Normal: 1.7 – 2.1 K Ω
If normal, check b below.
Faulty: Replace the manifold assembly.
(Service Procedure IGI-8, page 51)
b. Measure the voltage at the changeover solenoid
(SV3), brown – black wires.
Normal: 80 – 100 VDC
If normal, reconfirm gas pressures are correct.
Faulty: Replace the PCB unit.
(Service Procedure IGI-2, page 49)
VI - TROUBLESHOOTING
(cont.)
BEFORE CARRYING OUT CHECKS MARKED WITH A # SIGN, DISCONNECT THE POWER SUPPLY.