Question about Microwave Ovens
Hello, First, if your thermostat has an ECO (High Limit) reset button, turn the power off at the breaker. Press the reset button. Apply power. Here is the procedure to further check the heater: 1. This procedure assumes line voltage, ECO and elements 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 of thermostat. 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 A) Rated voltage NOT present, check wire connections from thermostat to element. B) Rated voltage IS present, Repeat element testing. To test element: Step 1. TURN OFF POWER TO WATER HEATER. Step 2. Remove access cover(s) from front of water heater. Remove insulation and plastic cover from thermostat. Step 3. Disconnect wires from heating element. Step 4. Set multi-meter to ?ohms? setting. Step 5. Touch probes of multi-meter to screw terminals of heating element. Step 6. Reading should be 12.8 ohms (±6%) for a 240 volt, 4500 watt element. If infinity, element is open. Here is the service manual for Bradford White heaters. This covers several models. http://www.bradfordwhite.com/images/shared/pdfs/manuals/238-47104-00A.pdf
Posted on Dec 10, 2009
Test the thermostat.
The thermostat is tested cutting its contacts and reading Ohms with a multimeter set at Rx1.
A good thermostat will read low or no impedance at room temperature, and will cutoff at limit temperature.
An alternative way to test a thermostat is bypassing it.
Test and eventually replace the thermostat. If thermostat is good check wiring and electronic control.
All test and repair must be done by a trained technician.
Posted on Dec 09, 2009
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Posted on Jan 02, 2017
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