Redring AE125, AE115 manual Troubleshooting, Cold water only Neon light off

Page 12

Troubleshooting

WARNING

Always switch off the electricity supply to the unit before you remove the cover.

IMPORTANT:

If you are unable to perform the tasks listed below, or need additional assistance please contact your original installer/licensed electrician.

 

Cold water only – Neon light off

Flow rate is too

Verify the flow rate out of fixture is at or above the minimum activation rate

low

required for the unit to activate. (Activation rates: AE115 = 0.6 GPM, AE125 = 0.8

 

GPM).

 

 

The water supply

Verify plumbing connections are correct (See Diagram 1, Page 4). Reconnect the

is connected to

water supply to the inlet of the unit (marked blue).

the outlet of the

 

unit

 

 

 

Plumbing

To test for a plumbing crossover, turn off power supply to the heater. Close

crossover

installer supplied cold water shut off valve (if none installed, install before

 

proceeding). Open all hot water taps supplied by the heater. Wait 5 minutes and

 

check all taps. Any water running is a sign of a plumbing crossover. Consult a

 

local plumber or service person 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. Let all taps run until there is no air coming out

 

of the fixtures. Shut off all hot water taps. Turn power supply on to the heater.

 

Return heater to service. (This procedure will prevent the heating elements from

 

burning out).

 

 

The flow

Turn off the power supply to the heater and remove the cover. Observe if the flow

transducer is not

transducer "spins" when the water is turned on. Please note the flow transducer

spinning

spins at a high speed and can appear to be stopped when actually spinning. It is

 

recommended to observe the flow transducer without water flowing, then turn on a

 

hot water tap while observing the flow transducer. If the flow transducer is not

 

spinning, remove and flush flow transducer. See the technical support section of

 

www.boschhotwater.com for more detailed instruction on removing the flow

 

transducer.

 

 

One or more of the

Turn off the power to the heater, remove the cover and locate thermal cutouts on

heating module

the top of each heating module. Try resetting each cutout by pushing the reset

thermal cut-outs

button located in the center of the cutout. Determine and fix the cause of the

has tripped

overheating. Obstructions in the water path can restrict the flow of water through

 

the heater causing it to overheat. Verify the heater’s inlet filter screen and all

 

outlets served by the heater are clear of debris. Ensure the heater is not being fed

 

preheated water. This water heater is designed for a cold water supply only. If

 

thermal cut out does not reset, check for continuity through each cutout (less than

 

0.5 Ohms). If any cutout reads more than 0.5 Ohms or open, then it may be

 

defective and should be replaced.

 

 

No electricity at

Have a licensed electrician verify proper wiring and adequate voltage on the

the heater or one

terminal block inside the water heater. See the “Electrical connections” section on

of the supplies has

Page 5 of this manual.

failed

 

 

 

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Contents Page Important Safety Instructions ContentsInstalling the PowerStar SpecificationsLocating the Powerstar AE115 Unit AE125 UnitMounting the Powerstar DiagramWater Connections US wiring Electrical connectionsDiagram Connecting the supply cable Canada only not for the USA Not ForStarting up the PowerStar Adjusting the temperature dialAdjusting the flow Checking for leaks and purging airHow the PowerStar works For exampleUsing the PowerStar Maintenance Part Description Number Refer to Diagram 1,Spare Parts Check inlet water filter screen once a yearTroubleshooting Cold water only Neon light offWater too cold Neon light on Using an Ohmmeter to check for Premature element failure Water flow too lowPowerStar Water Temperature Too HotWater Temperature Fluctuates Exclusions Bosch Water Heating Mad River Park Waitsfield VT Toll Free