Bosch C 1210 ESC Referenzhandbuch

Technical Service Bulletin:

Removing & Replacing The Water Valve

Models: C1210ESC, C1210ES, C1050ES, 940ES, 940ESO, 830ES

Introduction

 When replacing the watervalve, it is very important to drain all

water from the water heater beforehand to prevent water

damage to the internal electronics.

Tools needed:

 Phillips head screwdriver

 Bucket to catch draining water

 Plumber’s grease

Removing the water valve

1. Press On/Off button to Off and unplug power cord from electrical

outlet.

2. Loosen two Phillips head screws located at bottom rear of cover.

(Fig. 1).

3. Lift front cover upward and remove. (Fig. 1).

Step 1 Step 2

tep

Figure 1

4. Remove 3 Phillips screws from control unit (Fig. 2, step 1)

4. Place water heater‘s control unit into the service position.

(Fig. 2, step 2).

Step 2Step

Figure 2

Water

valve

5. Close installer supplied inlet and outlet shutoff valves.

6. Relieve water pressure from unit by opening pressure relief valve

on hot outlet side of unit. Have a bucket ready to catch the

draining water. Drain water from unit by removing cold water

inlet connection on bottom of heater.

Data subject to change without notice | Printed in the USA | BTC 740002319 A | 07.2010 Bosch Thermotechnology Corp.

Technical Service Bulletin

18 | Removing & Replacing The Water Valve

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-866-642-3198

Fax: 1-603-584-1687

www.boschpro.com

7. Unplug smaller wire connectors (A) from water valve.

(Fig. 3).

8. Remove pipe clips (C) located at the base and side of water

valve. (Fig. 3).

9. With a rag ready to catch residual water, lift water valve upwards

to separate it from the brass inlet connection (D). (Fig. 3).

Please note certain models may not have a water lter screen in

the base of the water valve.

10. Again with a rag ready to catch residual water, pull water valve

from pipe (E). (Fig. 3).

11. Remove water valve from heater and remove main wire plug

connection (B) from water valve. (Fig. 3)..

Figure 3

Replacing the water valve

1. Lubricate o-rings (F) with plumbers grease to prevent o-ring

damage or leaks. (Fig. 3).

2. Install replacement water valve by seating the side pipe

connection (E) rst (Fig. 3). Be careful to push water valve body

past o-ring on connecting pipe.

3. Reconnect clip (C) for side pipe connection. (Fig. 3).

4. Reinstall water valve onto brass inlet tting (D) (Fig. 3). Be

careful to seat water valve body past o-ring on inlet tting.

5. Reconnect remaining clip (C) on inlet tting connection (Fig. 3).

6. Check that both clips (C) are seated correctly in the anges

(Fig. 2). Improper seating will result in water leaks.

7. Reconnect main wire plug connection (B) to water valve. (Fig. 3).

8. Reconnect smaller wire connectors (A) for the water valve and

temperature sensor wires. (Fig. 3).

9. Open installer supplied inlet and outlet shutoff valves and

inspect for water leaks.

10. If no water leaks are present, return control unit to normal

position and secure with 3 Phillips screws (Fig 2). Plug power

cord into electrical outlet and push power button back to "On"

position. If an error code appears on the heater display, reset

the unit with the reset button. If error code reappears on the

display, press power switch to Off and check all wire

connections.

11. Push power switch back to On. If no errors are present, replace

cover and return heater to normal operation.

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