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

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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