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Troubleshooting: Ariston GL 2.5, 4.0, 6+

To troubleshoot your Ariston GL 2.5, 4.0, or 6+, please click on one of the following troubleshooting topics below (click again to collapse the topic):

How Do I Install the Ariston Unit? >
  1. It is important that the plumbing not have any check valves or back flow prevention devices before the heater. These devices can prevent thermal expansion and cause pressures to exceed 150 psi. The excess pressure may cause the pressure/temperature relief valve to discharge, and may cause premature failure of the element gasket.
  2. Use the supplied pressure/temperature relief valve for the heater. If an alternate is used, ensure the valve is rated for a maximum pressure of 150 psi and a max water temperature of 210F. The temperature probe should not extend beyond 4 inches in order to maintain adequate distance from the heating element.
  3. When filling tank, leave hot outlet tap at sink open while filling to displace all air in tank. Do not energize heater until all air is out of tank. Energizing the heater dry will cause element failure.

Adjusting the Temperature >
  1. If the water temperature is too hot, adjusting the thermostat counter clockwise will lower the temperature. See: Setting thermostat.
  2. If the water temperature is too cold, adjusting the thermostat clockwise will lower the temperature. See: Setting thermostat.
  3. When the heater has reached the temperature set by the thermostat, the indicator light will go off. If the temperature is not at the desired set point, adjust as outlined in either step 1 or 2.

Ariston Stopped Heating the Water >
  1. If the water temperature is too hot, adjusting the thermostat counter clockwise will lower the temperature. See: Setting thermostat.
  2. If the water temperature is too cold, adjusting the thermostat clockwise will lower the temperature. See: Setting thermostat.
  3. When the heater has reached the temperature set by the thermostat, the indicator light will go off. If the temperature is not at the desired set point, adjust as outlined in either step 1 or 2.

Water is Leaking from the Ariston >
  1. Water leaking from either water fitting connection:
    • Inspect the fittings.
    • If they are corroded, replace the fittings. If the fittings are intact, the threaded inlet and outlet openings may be damaged from electrolysis. The openings are part of the inner tank and cannot be repaired. The tank should be replaced. Read warranty statement.
  2. Water relieving from the pressure/temperature relief valve:
    • Verify the relief valve rated for a maximum pressure of 150 psi and a max water temperature of 210F. The temperature probe should not extend beyond 4 inches in order to maintain adequate distance from the heating element.
    • If any plumbing work has been done recently, verify there are no backflow prevention devices installed on the cold side of the tank. Backflow prevention devices can prevent thermal expansion and cause pressures to exceed 150 psi. Check the building inlet water pressure. A faulty water pressure regulator can cause pressures to exceed the 150 psi.
    • Observe the thermostat indicator light while heating. When the heater has reached the temperature set point, the indicator light should go out to prevent overheating. If the water being discharged is steaming and the indicator light is still on while discharging the thermostat is defective and should be replaced. 
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  3. Water leaking from behind the front cover:
    • Disconnect the plug from the outlet.
    • Remove front cover and inspect the gasket around the element. If leaking from the gasket, replace gasket.
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  4. A water leak from any other location on the tank cannot be repaired and the tank should be replaced. Read warranty statement.

Water is Discolored or Smelly >
  1. There is a magnesium anode rod in the heater that will slowly deteriorate during use. It is designed to absorb minerals in the water in order to protect the element. The rate of deterioration depends on water quality. When the anode rod is spent, water may become discolored or smelly. It is important to inspect and replace the anode when it is spent to prevent damage to the tank or the element.
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