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34
13) Water is Warm at times:
The UV light should be plugged in all the times to ensure full disinfection. When the system sits idle,
the water sitting inside the UV chamber can heat up due to the UV light rays. It is normal to experience
some warm water for the first 1-2 cups at times, but after some water has passed through, the water will
then come out at room temperature.
Close
Tank
Valve
Tilt
System
If the noise comes back, try the above procedure again another 2-3 times. Sometimes it takes several
tries to get rid of all the air in the system.
If the noise persists after a few days, that means there is air in your water source, or the current Check
Valve is resonating with your water pressure and pipes, creating the noise.
In this case, a new Check Valve will solve the problem. Contact APEC customer service for assistance.
* * * End Trouble-Shoot Guide * * *
Fig. 18
Step 1 Step 2 Step 3
14) RO Makes Humming Noise
When RO makes a humming noise, most likely it’s caused by air bubbles being trapped in the “Check
Valve” during installation. See check valve on Fig. 17, point E (Page 29).
To purge air from the check valve, do as follows:
Step 1: Close the tank’s valve.
Step 2: Tilt the RO system to the right. Put something under the 3rd filter housing to keep RO tilted. This
helps dislodge the air bubbles from the Check Valve.
Step 3: Turn on the RO spigot. Let pure water flow throuh the spigot for about 1 minute. This forces the
air to flow directly out to the spigot, bypassing the tank.
Step 4: Turn off the spigot. Wait for about 10 seconds. Repeat Step 3 again. Do that 3-4 times. If you
see air sputtering out of the spigot, repeat Step-3 until pure water can flow smoothly from the spigot, or
until the noise goes away.
Step 5: When the noise is gone, open the tank valve, let RO run as usual.
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