Q:5 Cold water only and Neon light Off?

There can be several reasons for this. First you need to check if the flow rate is too low. A .8GPM is required for the unit to activate. If that is in order then check if the water supply is connected to the outlet of the unit. Remember to reconnect the water supply to the inlet of the unit.

Another cause could be that one or more of the heating module thermal cut-outs has tripped. You can correct this easily. Simply turn the heater off, remove the cover and locate thermal cutouts on the top of each heating module. Reset each cutout by pushing the red reset button located in the center.

Obstructions in the water path can restrict the flow of water through the heater causing it to overheat. You need to clean the heater’s inlet filter screen and make sure that all outlets served by the heater are clear of debris. Also bear in mind that the heater is not fed by preheated water as it is designed for a cold water feed only. If thermal cut outs keep tripping, check for continuity through the elements.

You can also test for a plumbing crossover, by first turning the heater off and then closing the installer supplied cold water shut off valve (You would need to install it if it isn't already installed, before proceeding). Then open all hot water taps that are supplied by the heater and check them all. Any water running is a sign of a plumbing crossover. You would need to consult a local plumber for help in correcting a plumbing crossover. To return the heater to service, reinstall cover, open the inlet water supply to the heater and open all hot water taps. Make sure there's no air coming out of the fixtures. Shut off all hot water taps and finally turn the heater on.

One cause can also be that the flow transducer is not spinning. To correct this, turn off the heater and remove the cover. Check if the flow transducer "spins" when the water is turned on. Since the flow transducer spins at a high speed it is possible that it may appear to be stopped even when it's spinning. You need to observe the flow transducer without water flowing, then turn on a hot water tap. However, if the flow transducer is not spinning you'd need to remove, and then flush flow the transducer.

You would also need to check if there's no electricity supplied to the heater or if one of the supplies has failed. Get it checked by a licensed electrician who can verify proper wiring and adequate voltage on the terminal block inside the water heater.

• 1. No neon light? No hot water?
• 2. Water is too hot.
• 3. Water not hot enough.
• 4. Hot water temperature fluctuates at the top.




AE115, AE125

• 5. Cold water only and Neon light Off?
• 6. Water too cold and Neon light On?
• 7. Water flow too low.
• 8. Water temperature too hot?
• 9. Water temperature fluctuates.