238-47104-00A - Bradford White

SERVICE PROCEDURE RE-IVLight Duty CommercialThermostat TestingDouble Element, Simultaneous, Single PhaseOperation.WARNINGHigh voltage exposure. Use caution to avoidpersonal injury during this procedure.Water In Tank Is Cold Or Not Enough HotWater With Power ON.1. This procedure assumes line voltage,ECO and elements are in working order.2. Adjust temperature setting for boththermostats to the highest setting.3. Turn power “ON” to water heater.4. Set multi-meter to “Volts AC”5. Check across terminals L4 and T2 ofupper thermostat (see illustration 35).A) Rated voltage NOT present,Recheck upper ECO(see page 14). If ECOis okay, replace upper thermostat.B) Rated voltage IS present,proceed to next step.6. Check across upper element terminals(see illustration 36).A) Rated voltage NOT present,check wire connections fromthermostat to upper element.B) Rated voltage IS present,Repeat element testingsee page 15.7. Check across terminal L3 of upper thermostatand T2 of lower thermostat (see illustration 37).A) Rated voltage NOT present,Check ECO (see page 14) & wireconnections at upper & lowerthermostats. If okay,replace lower thermostat.B) Rated voltage IS present,proceed to next step.8. Check across lower element terminals(see illustration 38).A) Rated voltage NOT present,check lower element wireconnections to the thermostats.B) Rated voltage IS present,Repeat lower element testingsee page 15WARNINGBe sure thermostats are reset totheir original temperature settingsas found prior to thermostattestingIllustration 35 Illustration 36Illustration 37 Illustration 38Page 2727