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Troubleshooting; Introduction 1; Pilot Will Not Light 1; Pilot Will Light But Not Stay On When Button Released 1 - Bosch AQ 125BO LP Use And Care Manual

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Troubleshooting
6
Troubleshooting
6.1
Introduction
Many
of
the
questions
customers
ask
regarding
operation
of this unit can be answered
by following
the
troubleshooting
steps as outlined
below. Visit our web
site
at www.boschhotwater.com
for
more
detailed
troubleshooting.
For best results,
perform
each
step
before proceeding
to the next. The suggested
solutions
may require that the cover be taken off. (See chapter
3.4).
6,2
Pilot will not light
1. If the unit was just installed
or the gas lines have
been worked on, there may be air in the gas line. To
bleed air out of the gas line, hold down the gas valve
button while hitting the piezo ignitor button '_-, every
second.
2. Check to make sure the manual gas shut off valve
is in the open position.
Have licensed
gas technician
or service person
check the presence
of gas at the
gas pressure
measuring
tap on the left side of the
gas control valve. If gas is not present, the regulator
may
be
locked
up
and
need
replacing.
See
chapter 3.5 for required
gas pressures.
3. Clean or replace the pilot orifice. See chapter 5.3
for instructions.
6,3
Pilot will light but not stay on when
button released
1. When lighting
pilot ensure the gas valve button
is
fully depressed
and held down
for at least 15 sec
after pilot is lit.
2. Pilot flame should be blue in color and hitting the
thermocouple
tip. See chapter 5.3 for instructions.
3. Check the electromagnet
connections.
Electroma-
gnet
is located
on the right side of the gas valve
behind
the
piezo
push-button
assembly.
The
Electromagnet
connection
is a large aluminum 17mm
hex head nut. The thermocouple
end is a 5 mm brass
nut which
screws
into the 17 mm nut. Tighten
both
nuts snugly but do not over tighten.
4. Check
if connections
at the ECO
are loose or
corroded.
Clean any corrosion
with very fine sand
paper or an eraser and reconnect
leads.
5. If cleaning the terminals
attached
to the ECO did
not fix the problem,
connect
a jumper wire between
the two wires attached
to the ECO and try to relight
the pilot. If the pilot flame now remains on, the ECO
may be defective
and need to be replaced.
Do not
leave jumper connected.
6. Have a licensed
gas technician
verify the proper
operation
of the thermocouple
by measuring
the
millivoltage
from the thermocouple
lead to ground.
The expected
reading is 24mVDC
or greater.
6.4
Burners do not ignite with water
flow
1. Verify the pilot is lit.
2. Turn temperature
adjustment
knob
all the way
clockwise.
Turn hot water faucet to full on position
and fill a quart container.
If the container
fills in 30
seconds or less your flow rate (1/2 gallon per minute)
is sufficient
to activate
the heater. If the knob is full
counter clockwise,
the container will need to fill in 14
seconds
(1.1 gallons
per minute)
to activate
the
heater. Check for restrictions
in the water line such
as clogged
aerators
or a clogged
inlet water
filter
screen if flow rate is not sufficient.
3. Clean water inlet filter screen. See chapter 5.2.
4. Shut off installer supplied
cold water supply valve
(if none installed,
install before proceeding).
Open all
hot water
taps
supplied
by the 125
BO. Wait
5
minutes and check all taps. Water
running is a sign
of a plumbing
cross-over.
Consult a local plumber or
service person for help in correcting
plumbing
cross-
over.
5. Verify the cold water supply
is connected
to the
right side of the heater.
6. Service
the
water
valve. See
chapter 5.2
for
intervals and instructions.
6.5
Hot water temp fluctuates
from hot
to cold
1. Shut off installer supplied
cold water supply valve
(if none installed, install before proceeding).
Open all
hot water
taps supplied
by the 125
BO.
Wait
5
minutes and check all taps. Water
running is a sign
of a plumbing
cross-over.
Consult a local plumber or
service person for help in correcting
plumbing
cross-
over.
2. Check for restrictions
in the water
line such as
clogged
aerators, clogged
shower head or a clogged
inlet water filter screen.
3. If hot water is so hot that a large amount of cold
water
must be introduced
to lower temperature
to
comfortable
level, lower
output
temperature.
See
chapter
4.4 for instructions.
4. Check the inlet water pressure.
For installation
on
a private well system with the use of a pressure tank,
the lowest
pressure
range setting
recommended
is
30-50
psi
(2.07
- 3.45
bar).
Confirm
that
the
pressure
tank is not water logged.
8716473147
17

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