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Mitsubishi air conditioners have airflow patterns from specially designed Horizontal Vanes ensuring optimum temperature distribution and comfort, pushing air into larger living spaces. Home > Home & Appliances > Kitchen Appliances > Advice on Induction Cookers Advice on Induction Cookers ReviewsCAUTION: Electrical repairs can be dangerous, especially around water. Repairs must be made by a qualified electrician or spa technician. Regardless of who performs the work, make certain that all electrical power to the hot tub or spa is disconnected prior to making any inspections or repairs. Shut the  power off at the service panel, and as a secondary precaution, disconnect the power to the spa as well. Do not attempt to perform electrical repairs unless you are qualified. All electrical resistance heaters work the same way: current is passed through a special element, which creates heat.  When the current flow is interrupted or diverted, no heat is created. Heater Element & Assembly

In hot tubs, the element coil is housed in a heater assembly housing, which exchanges heat produced by the element to the water, as it flows through the tube.  The assembly may also incorporate sensors: hot tub high limit switch and thermostat.  Heater assemblies come in various forms, a common type shown here. Spa Heater Element Construction Inside is the heating coil [13], a filament encased in insulating powder [11].  It is surrounded by a sheath of Incoloy [12], a heat and corrosion resistant alloy which isolates the electrical coil and insulating filler from contact with water. Reference this diagram when performing diagnostics below. Common Symptoms & Causes of Heater Failure: A heating element is similar to a light bulb in that its filament [13] is a heating coil which in time can break or burn out.  Assuming that the heater's connection terminals [1] are in good condition, it is properly energized by your hot tub's control system when it should be, and that the thermostat and high limit switches are functioning properly, no heat can indicate a burned-out or broken heating coil, which results in an open circuit.

Note: Catastrophic failure of the heater element can be caused by a dry fire.  This occurs when the heater is operated with little or no water present, or a greatly reduced water flow, which can cause the heating coil [13] and/or outer sheath [12] to actually melt.  The element will often have visible signs of damage when a dry fire occurs.  Although properly functioning high limit switches, pressure/flow switches, and thermostats are designed to help prevent this condition, like all devices, these too can fail in hot tubs. Low heat is more often caused by a reduced water flow rather than an electrical problem with the heater itself.  Check your filter to make sure it is not clogged, and that there are no other obstructions restricting spa water flow.  Excessive scale buildup on the heater element, as a result of poor water balance, can reduce heating efficiency.  Left is an example of a spa heater element suffering from calcium scale buildup. This buildup not only reduces heater efficiency, it eventually results in element failure.

Regular use of Spa System Flush can help eliminate scale. A heater causing the GFCI to trip, even intermittently, more often than not indicates a short circuit caused by water intrusion into the heater element's outer sheath [12].  Water can seep inside at various other entry points such as the epoxy seal [5] or at the braze [9], but the most common cause will be a pin hole in the sheath caused by corrosion.  When the electrical current finds a path from the heating coil [13] to the water, the short will cause the GFCI to trip.  If you do see a hole in the sheath, there is no need to proceed with testing-- the element is toast! The best and safest way to evaluate heater elements is to first take them out of circuit by disconnecting BOTH power leads from the heater terminals [1], and then take measurements with an ohm meter. Be certain that all power is disconnected to the spa before making inspections, and before removal and testing of the heater. To test hot tub heating elements for integrity, use an ohm meter on its lowest setting. 

With the meter's test leads, measure the resistance between the two terminals as shown.  The acceptable resistance range for heaters used in most hot tubs is between 9 - 12 ohms (a few may be as high as 25 ohms, depending upon kilowatt rating). A reading which is too low indicates a bad unit: short circuit.  A very high (or infinite) reading indicates a bad unit: open circuit or limited conductivity. Now test for a short to ground.  On the meter's highest ohm range setting, measure between one element terminal [1] and the sheath [12] of the element.  You should get an infinite reading on the ohm meter, indicating no continuity to ground.  Any ohms reading indicates a short, and bad element. Installing Replacement Spa Heater Element When connecting the electrical wires to a heater element, always use two wrenches to avoid terminal damage. Hold your lower wrench stationary while firmly tightening the top nut. This will prevent twisting of the terminal pin, or fracturing its epoxy potting.

If the heater element checks out OK, the problem may be with the high limit switch or the thermostat.  These can be tested by disconnecting both wires to each and checking for continuity.  Keep in mind that high limits and thermostats are merely on/off switches which are triggered by heat sensors.  The photos below show the ohm meter test points for each component. These are normally closed (continuity) but trip open with excessive temperature, which protects the heater element.  Check between the two terminals.  If there is no continuity, the high limit has tripped. Depress reset button & retest. Functioning thermostats are closed when turned fully clockwise, and open when turned fully counter-clockwise.  Meter should indicate a continuity when clockwise, and an open circuit  (no continuity) when counter-clockwise. If your hot tub's heater element, thermostat, and high limit switch all check out good, refer to our Hot Tub Equipment Troubleshooting Guide.