Neon Light Off - Water Not Hot Service Bulletin EP-01

Neon Light Off - Water Not Hot Service Bulletin EP-01
Service Bulletin EP-01
Models: AE115, AE125, RP17PT, RP27PT
Neon Light Off - Water Not Hot
Figure 2
PowerStar AE115 & AE125
RP27PT terminal block
Powerstream Pro RP17PT & RP27PT
Supply 1
Supply 2
Supply 3
WARNING
Electricity is EXTREMELY Dangerous.
TAKE EXTRA PRECAUTIONS and ensure
all circuit breakers are off before
PERFORMING ANY WORK on THE HEATER.
To Supply 1
To Supply 2
To Supply 3
Neon Light Off - Water Not Hot
1.Check electrical supply. The AE115 and RP17PT require two
independent 240VAC circuits protected by two separate and
independent double pole breakers rated at 40 amps each. See
Fig. 1. Minimum wire size is #8 AWG.
Figure 1
AE115/RP17PT terminal block
Supply 1
Supply 2
To Supply 1
To Supply 2
2 independent
40 amp double-pole
circuit breakers
The AE125 and RP27PT require three independent 240VAC
circuits protected by three separate and independent double
pole breakers rated at 40 amps each. See Fig. 2. Minimum wire
size is #8 AWG.
3 independent
40 amp double-pole
circuit breakers
2. Verify that plumbing connections are correct. Inlet water supply
must be connected to inlet of heater (marked blue, on right
side).
3. Verify minimum flow rate for activation. The AE115 and RP17PT
require 0.6 GPM (@ 15 PSI minimum water pressure). The
AE125 and RP27PT require 0.8 GPM (@ 15 PSI minimum water
pressure).
4. Check for plumbing crossover. Turn power supply to heater off. Turn cold water supply off to the heater, then open each hot
water faucet. No water flow should be evident. If there is even
a trickle of water flow, then there is a plumbing crossover and it
must be corrected for the heater to operate properly.
Note: Ensure that heater is filled with water before restoring power
to the heater.
5. Check inlet filter screen. See Fig. 3.
1 2 | EP-01 | AE115, AE125, RP17PT, RP27PT
Service bulletin
Figure 3
Top
Flow
transducer
Bottom
Outlet
Inlet
Inlet
I l t
Filter
6. Check flow transducer. See Fig. 3. Turn off power supply to
heater. Remove front cover and with a flashlight, visually
observe if the flow transducer spins when a hot water tap is
turned on and off. Verify transducer connection to circuit board.
Circuit board cover will need to be removed.
7. Circuit board failure. Call Bosch Technical Support.
Bosch Thermotechnology Corp.
50 Wentworth Avenue
Londonderry, NH 03053
Tel: 1-866-642-3198
Fax: 1-603-584-1681
www.boschpro.com
Data subject to change without notice | Printed in the USA | 12.2007
Bosch Thermotechnology Corp.
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