Neon Light On - Water Not Hot Service Bulletin EP-02

Neon Light On - Water Not Hot Service Bulletin EP-02
Service Bulletin EP-02
Models: AE115, AE125, RP17PT, RP27PT
Neon Light On - Water Not Hot
PowerStar AE115 & AE125
Powerstream Pro RP17PT & RP27PT
6. One or more of the heater module thermal cutouts has tripped.
Turn off power supply to heater, remove cover and reset by
pushing button on top of thermal cutout. See Fig. 1. If button
clicks when pushed in, thermal cutout has tripped.
Figure 1
WARNING
Electricity is EXTREMELY Dangerous.
TAKE EXTRA PRECAUTIONS and ensure
all circuit breakers are off before
PERFORMING ANY WORK on THE HEATER.
Top
Neon Light On - Water Not Hot
1.Temperature control dial is set too low. Turn temperature
control dial clockwise for hotter water.
2. Verify plumbing connections are correct. Inlet water supply must
be connected to the inlet side of the heater (marked blue, on
right side)
3. Water flow is too high or inlet water temperature is too cold. Reduce water flow, see installation manual Graph 1, page 8.
4.One of the power supplies is not on. Check the supply voltages
to the heater and rectify if necessary.
5.The incoming voltage has dropped. This is likely an issue with
power supplied to the building. Measure voltage with heater
running at maximum flow and maximum temperature setting.
Note: Units rated for 240VAC can operate at 220VAC or 208VAC with
reduced output. The output will vary in accordance with the
following ratios in Table 1 below.
Table 1
Volts
208
220
240
Output ratio
.75
.84
1.0
Flow
transducer
Bottom
Outlet
Inlet
7. If thermal cutouts did not reset, check resistance of cutouts on
each heating module. Take readings across the upper wire
connections or the lower wire connections. Models AE115 and
RP17PT only have lower wire connections. Resistance should be
less than 0.5 ohms (Ω). If "open" or more than 0.5 ohms (Ω),
thermal cutout may need to be replaced.
1 2 | EP-02 | AE115, AE125, RP17PT, RP27PT
Service bulletin
8. Element failure. Turn power supply to heater off, remove front
cover and verify correct resistance of each element. See Figures
2 and 3 for proper test points and resistance values. Models
AE115 and RP17PT do not have middle elements. If values are
different, call Bosch Technical Support.
Figure 3
RIGHT MODULE Top View
Rear of Heater
Figure 2
LEFT MODULE Top View
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Mi
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er
Inn
er
Inn
Rear of Heater
le
dd
Mi
er
Inn
er
Inn
le
dd
Mi
Ou
Thermal
Cutout
C
ter
Front of Heater
Thermal
Cutout
C
Front of Heater
Meter probes
Outer to Outer
Middle to Middle
Inner to Inner
ter
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dd
Mi
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te
Ou
Ou
Meter probes
Outer to Outer
Middle to Middle
Inner to Inner
Ohm reading (Ω)
10.5 ± 0.5 Ohms
11.5 ± 0.5 Ohms
21.0 ± 1.0 Ohms
Ohm reading (Ω)
10.5 ± 0.5 Ohms
11.5 ± 0.5 Ohms
15.0 ± 1.0 Ohms
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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