WW
WW
W
ARNINARNIN
ARNINARNIN
ARNIN
GG
GG
G
LP & NLP & N
LP & NLP & N
LP & N
G ARE EXTREMELG ARE EXTREMEL
G ARE EXTREMELG ARE EXTREMEL
G ARE EXTREMEL
Y FLY FL
Y FLY FL
Y FL
AMMABLE SOAMMABLE SO
AMMABLE SOAMMABLE SO
AMMABLE SO
TT
TT
T
AKE EXTRA PRECAAKE EXTRA PRECA
AKE EXTRA PRECAAKE EXTRA PRECA
AKE EXTRA PRECA
UTIONS WHENUTIONS WHEN
UTIONS WHENUTIONS WHEN
UTIONS WHEN
PERFPERF
PERFPERF
PERF
ORMINORMIN
ORMINORMIN
ORMIN
G ANY WG ANY W
G ANY WG ANY W
G ANY W
ORK TORK T
ORK TORK T
ORK T
O THE HEAO THE HEA
O THE HEAO THE HEA
O THE HEA
TERTER
TERTER
TER
CT-23
page 1 of 2
rev 10/06
Bosch Water Heating
340 Mad River Park, Waitsfield, VT 05673
©BBT NORTH AMERICA CORPORATION
Bosch Group
WATER VALVE REBUILD
MODELS: 1000P, 1600P, 1600H
260PN, 425PN, 425HN
A. Preparation
Tools needed:
Philips screwdriver
Flat screwdriver
Needle-nosed pliers
Container to catch water
1. Shut off gas and water supply to heater.
2. Open fauce t to relieve pressure.
3. Pull off temperature adjustment knob (all models)
and gas control knob(1600H, 425HN only).
4. Unscrew cover screws and remove cover.
5. Unscrew cold water supply pipe from rear of water
valve and catch remaining water.
6. Disconnect water pipe to heat exchanger by remov-
ing retaining clip and gently pulling pipe to the right.
B. Removing water valve
1. Suppor t water valve with one hand while releasing
water valve from gas valve by loosening 2 set screws
from underneath. (Fig. 1) Do not loosen 3 larger
screws holding plate onto bottom of gas valve or 1
screw holding on microswitch. Remove water valve
from heater.
••
••
• If set screws do not unscrew easily do not force
them as the gas valve may be damaged. Try a
descaling solution (whit e vinegar, CLR® or other
descaling solution) on screw threads. Let sit for 1
hour, try again to remove set screw(s) without forc-
ing.
••
••
• If still unable to remove, call 800-642-3111 for help.
C. Removing old parts
1. Remove the 5 cover screws from metal retaining plate
and separate 2 halves of water valve. (Fig. 2)
2. Remove and inspect diaphragm from water valve,
clean if necessary, replace if damaged or warped by
excessive heat. (Fig. 3, pos. 2)
3. Remove pushrod assembly by holding water valve
cover and pressing pushrod sleeve firmly against a
hard surface. (Fig. 3, pos. 10)
4. Remove retaining clip and threaded bushing to access
inlet water filter. Remove and clean or replace filter.
(Fig. 3, pos. 6)
5. Remove retaining clip (Fig. 3, pos. 7) and volumetric
flow governor. (Fig. 3, pos. 8)
6. Remove venturi from outlet port to heat exchanger.
Grasp with needle-nosed pliers and twist while
pulling. (Fig. 3, pos. 9) Ensure that venturi passages
are clean as well as passage in water valve body.
7. If the venturi or water valve body has evidence of
mineral build-up, soak in straight white vinegar for ½
hour. Brush parts clean and flush with water.
Water valve set screw location
FIGURE 1
2 Set
screws
Water Valve
FIGURE 2
Cover
screws(5)
Pushrod
sleeve
Threaded
bushing
(Water
filter)
Metal
retaining
plate
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