Bosch C950ES Manuel de référence

Technical Service Bulletin:

Resetting the Watervalve

Models: 830ES, 940ES-ESO, C950ES, C1050ES, 1210ES-ESC, T9800/T9900 SE(C)

Data subject to change without notice | Printed in the USA | BTC 740002333 A | 05.2018 Bosch Thermotechnology Corp.

A qualiﬁed service technician is recommended to perform the work.

Problem

Tankless water heater that doesn’t activate, and doesn’t show an error code.

Possible Cause

The watervalve may be clogged or needs to be reset.

Overview

Sometimes a tankless water heater doesn’t start up when water is turned on (above

activation rate), and also doesn’t give an error code. This can be due to the impeller

in the watervalve being stuck or clogged, the water valve being closed, or even just

a clogged inlet ﬁlter. Some of the models have an inlet ﬁlter accessible from outside

the machine, which you can inspect for debris ﬁrst. Other models have it directly

in line with the watervalve, in which you will have to disconnect and remove the

watervalve for access.

Procedure

1. Drain the machine down of any water on both the hot and cold sides.

2. Remove the inlet and outlet water clips and remove watervalve from the

machine. After it is removed, disconnect all wiring to the watervalve.

Inspect the screen for any blockage and clean if necessary.

3. Remove the 2 Phillips head screws that hold the watervalve engine to the

watervalve body (Fig. 1).

Figure 1

4. Remove the 2 Phillips head screws that hold the watervalve engine to the

watervalve body (Fig. 1).

5. Separate the 2 the watervalve body and the watervalve engine.

6. On the valve side, locate the brass gear. Rotate the gear counter clockwise

(towards the “0”) until it stops (Fig. 2).

Figure 2

All manuals and user guides at all-guides.com

Data subject to change without notice | Printed in the USA | BTC 740002333 A | 05.2018 Bosch Thermotechnology Corp.

Technical Service Bulletin

2 | Resetting the Watervalve

Bosch Thermotechnology Corp.

65 Grove Street

Watertown, MA 02472

Tel: 1-866-642-3198

Fax: 1-954-776-5529

www.boschheatingandcooling.com

7. On the motor side, slowly rotate the gear clockwise to “0” (Fig. 3). There are

gears inside this motor that cause resistance, do not try to move it fast or

you will damage the gearing.

Figure 3

8. Once that is completed, make sure you can blow through the valve freely

from the bottom where the cross diverter is (Fig. 4). When you forcefully

blow through the valve, you should hear the impeller spinning. If not, use

a small pick or similar device to manually move it. It should move freely

with no resistance. Any resistance could be signs of buildup inside the

valve. Flushing out the valve at this point would be your only way to clear

that obstruction. The impeller is not removable on these valves. If it can’t

spin freely by ﬂushing out the valve or manually rotating it, you may need to

replace the valve.

Figure 4

9. After performing the service, attach the watervalve engine to the watervalve

body with the 2 phillips head screws as shown in Fig. 1.

10. Plug the wiring back in, and reinstall the clips on both the incoming and

outgoing side of the valve.

11. Slowly turn on water supply to check for leaks, before powering up and

returning the tankless unit to service

All manuals and user guides at all-guides.com

Autres manuels pour C950ES

Ce manuel convient aux modèles suivants

Autres manuels Bosch Chauffe-eau

Bosch

Bosch US3 Document technique

Bosch

Bosch Tronic 3000T ES2.5 Document technique

Bosch

Bosch T4200 14-2D Mode d’emploi

Bosch

Bosch Greentherm 9000 Manuel utilisateur

Bosch

Bosch TR7000 Series Manuel utilisateur

Bosch

Bosch AQUA STAR 250SX LP Manuel utilisateur

Bosch

Bosch Tronic 2500 TO Manuel utilisateur

Bosch

Bosch Gas Water Heaters Mode d’emploi

Bosch

Bosch Tronic 5000 Manuel utilisateur

Bosch

Bosch Tronic 1000 Manuel utilisateur

Bosch

Bosch Therm 6000 S Manuel utilisateur

Bosch

Bosch HydroPower TF250-8G(10H) Document technique

Bosch

Bosch 250 SXO LP Manuel utilisateur

Bosch

Bosch TRONIC 3000 US3-2R Document technique

Bosch

Bosch Tronic 4000 Series Manuel utilisateur

Bosch

Bosch HydroPower 10H Manuel utilisateur

Bosch

Bosch TR4000 Manuel utilisateur

Bosch

Bosch AQ 125BO NG Manuel utilisateur

Bosch

Bosch AQUASTAR 125B LPL operati Manuel utilisateur

Bosch

Bosch Stora WP 400 PK Guide rapide

Bosch

Bosch 250SX Manuel utilisateur

Bosch

Bosch TR 6000R Series Manuel utilisateur

Bosch

Bosch TR2500TO 5 B Manuel utilisateur

Bosch

Bosch GWH-425-EF-N Manuel utilisateur

Manuels Chauffe-eau populaires d'autres marques

Kenmore

Kenmore 153.582400 Manuel utilisateur

Applimo

Applimo Edel AIR Manuel utilisateur

STIEBEL ELTRON

STIEBEL ELTRON Eltronom SHU 5 S Manuel utilisateur

clage

clage E-Mini Series Manuel utilisateur

Toyotomi

Toyotomi Oil Miser OM-180 Manuel utilisateur

Bradford White

Bradford White EF Series Manuel utilisateur

Eccotemp

Eccotemp 40-H Manuel utilisateur

Dimplex

Dimplex ECSd125-580 Mode d’emploi

Dux

Dux 32FCR6N Manuel utilisateur

Toyotomi

Toyotomi Oil Miser OM-148 (Type D) Guide de dépannage

Noritz

Noritz N-132M Manuel d'instructions

TESY

TESY GCV7/4S 10047 Fiche technique

A.O. Smith

A.O. Smith Gphe 50 Manuel utilisateur

Koryo

Koryo KWHZF15Y Manuel utilisateur

Pentair

Pentair PSC-14-4-02 Manuel utilisateur

GE 40M06AAG Instructions de montage

Thermor

Thermor AEROMAX SPLIT 2 Manuel utilisateur

American Hometec

American Hometec AHQ-B03X Manuel utilisateur