Parts List - Bosch GWH 425 HN User Manual
Bosch water heater user manual model 425hn
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Also See for GWH 425 HN:
- Applications manual (50 pages) ,
- Manual (29 pages) ,
- Service bulletin booklet (23 pages)
Table of Contents
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1
Cover
2
Temperature adjustment knob
3
Temperature adjustment collar
4
Draft diverter
5
Heat exchanger
7
Main burner
7
Main burner
8
Burner assembly washer
9
Throttle disc
10
Pilot burner
10
Pilot burner
11
Pilot electrode
12
Pilot orifice
12
Pilot orifice
13
Pilot tube
14
Washer pilot tube
15
Gas valve
15
Gas valve
16
Diaphragm switch
16
Diaphragm switch
17
Pilot electrovalve
18
Burner electrovalve
19
O-ring
20
Hydro-generator
21
Cold water pipe
22
Outlet flex hose
23
Washer
24
Water valve
25
Water valve cover
26
Diaphragm
27
Water inlet filter
28
Water valve selector screw
29
Volumetric water governor
30
Venturi
31
Electronic control box
32
Flame sensor cable
33
Electrode cable
34
Flue Gas Sensor
35
Set of cables
36
Pushrod
37
O-ring
38
O-ring
39
Water connection gasket
40
Water elbow fitting
41
Overheat sensor (ECO)
42
Connecting pipe hot
43
Washer
44
Flame sensor
45
Water valve set screw
8 705 421 752
8 702 000 111
8 700 403 008
8 705 505 354
8 705 406 235
8 708 120 298
NG
8 708 120 296
LP
8 710 103 060
8 700 100 174
LP
8 708 105 491
LP
8 718 105 051
NG
8 708 107 006
8 708 200 069
NG
8 708 200 312
LP
8 700 707 370
8 700 103 173
8 707 011 917
NG
8 707 011 945
LP
8 708 504 021
NG
8 708 504 049
LP
8 708 501 249
8 708 501 250
8 700 205 023
8 707 406 043
8 700 705 947
8 700 703 139
8 700 103 658
8 707 002 649
8 705 500 101
8 700 503 053
8 700 507 001
8 708 500 289
8 705 705 009
8 708 205 279
8 707 207 085
8 704 404 040
8 704 404 039
8 707 206 345
8 704 404 038
8 700 306 114
8 700 205 120
8 700 205 119
8 710 103 043
8 700 703 114
8 707 206 040
8 700 715 178
8 710 103 045
8 708 107 007
8 703 401 051
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Table of Contents
Troubleshooting
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Do you have a question about the GWH 425 HN and is the answer not in the manual?
Questions and answers
I removed the unit for the wall for renovation. When I put it back up it work for the first few times. On the last test run it came on like normal but when I shut it off the gas stayed on.
The Bosch GWH 425 HN gas unit should turn off when the ON/OFF switch is set to the OFF position and the gas valve is shut off. If the unit stays on after shutting it off, possible reasons could include:
1. Faulty ON/OFF Switch – The switch may not be functioning properly, preventing the unit from shutting down.
2. Gas Valve Issue – If the gas valve does not fully close, gas may continue flowing to the burner.
3. Flue Gas Sensor Malfunction – If the sensor incorrectly detects inadequate venting, it may cause unintended operation.
4. Negative Air Flow – Poor venting can result in improper burner shutdown.
A qualified service technician should inspect the unit to diagnose and fix the issue.
This answer is automatically generated