238-47104-00A - Bradford White

SERVICE PROCEDURE RE-IIIResidential Thermostat TestingSingle Element Operation orDouble Element, 4 Wire, Simultaneous, Single PhaseOperation.WARNINGHigh voltage exposure. Use caution to avoidpersonal injury during this procedure.Water In Tank Is Cold With Power ON.1. This procedure assumes line voltage, ECO andelements are in working order.2. Turn power “ON” to water heater.3. Set multi-meter to “Volts AC”.4. Check across terminals L4 and T2 ofthermostat (see illustration 6).A) Rated voltage NOT present,Recheck ECO. If ECO is okay,replace thermostat.B) Rated voltage IS present,proceed to next step.5. Check across element terminals(see illustration 7).A) Rated voltage NOT present,check wire connections fromthermostat to element.B) Rated voltage IS present,Repeat element testingsee page 15.Illustration 6Illustration 7Water Temperature In Tank Is Above Thermostat Setting.1. This procedure assumes line voltage, ECO andelements are in working order.2. Turn power “ON” to water heater.3. Set multi-meter to “Volts AC”.4. See illustration 6 above, check across terminals L4 and T2of thermostat.A) Rated voltage IS present,replace thermostat.B) Rated voltage NOT present,thermostat is okay.C) Lower than rated voltage IS present,recheck for grounded element(see page 15).Reference 4 Wire, Simultaneous, Single PhaseWiring diagram.NOTE: Wiring consists of two single element configurationsoperating independently.Page 1616