Bosch 715ES Manual de usuario

Models: 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES

Cleaning and replacing ignition group

Service Bulletin G3-23

Introduction

The ignition group consists of two ignition electrodes and one

ame sensing rod. These components may need to be cleaned

or the entire group replaced if the heater has frequent EC or EA

error codes or fails to produce a spark.

Tools needed:

Phillips head screwdriver

 8mm wrench or small adjustable wrench

Fine steel wool for cleaning

Preparation

1. Unplug water heater and turn off gas to heater using installer

supplied manual shut off valve.

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

(Fig. 1, step 1, pos. 1).

3. Lift front cover upward and remove. (Fig. 1, step 1, pos. 2 & 3)

4. Remove combustion cover by unclipping two upper and two

lower clips securing cover. (Fig. 1, step 2)

Step 1 Step 2

tep

Figure 1

Removing the ignition group

1. Locate ignition group. (Fig. 2, pos. 1).

2. Disconnect two large yellow ignition wires from ignition group.

(Fig. 2, pos. 2)

3. Disconnect small black ame sensor wire from ignition group.

(Fig. 2, pos. 3).

Figure 2

Data subject to change without notice | Printed in the USA | BTC710002310 A | 01.2009 Bosch Thermotechnology Corp.

Service bulletin

18 | G3-23 | 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES

Bosch Thermotechnology Corp.

50 Wentworth Avenue

Londonderry, NH 03053

Tel: 1-866-642-3198

Fax: 1-603-584-1681

www.boschhotwater.com

4. Remove two 8mm nuts from ignition group. (Fig. 3, pos. 1).

5. Remove ignition group and gasket from the water heater. Leave

the observation window in place.

Figure 3

Cleaning ignition group

1. If the ignition group gasket is discolored or torn, replace with a

new gasket. (Fig. 4)

2. Using steel wool, gently polish all metal surfaces of the ame

sensor and the ignition electrodes. (Fig. 4)

Figure 4

Gasket

Flame

sensor

Ignition

electrodes

Replacing ignition group

1. Gently place ignition group gasket over left bolt stud for 8mm

nut. The stud will hold the gasket in place.

(Fig. 3, pos. 1)

2. Carefully feed tips of ignition group into heat exchanger ensuring

that the ame sensor rod is on the far left.

3. Ensure a proper seal between the heat exchanger and ignition

group.

4. Replace and tighten two 8mm retaining nuts. (Fig. 3, pos. 1).

5. Reconnect two large ignition wires to the right and center igniter

terminals. (Fig. 2, pos. 2).

6. Reconnect small black ame sensor wire to the left terminal.

(Fig. 2, pos. 3).

7. Ensure that all three wire connections t securely on the

terminals.

8. Replace combustion cover and front cover. (Fig. 1).

9. Plug in water heater‘s power cord and press On/Off button to

"ON". Reset any error that is displayed.

10. Open manual gas shutoff valve.

11. Return water heater to service.

!WARNING

FAILURE TO PROPERLY SEAL THE

IGNITION GROUP WITH GASKET MAY

CREATE A HAZARDOUS CONDITION

CAUSING SEVERE PERSONAL INJURY

OR DEATH.

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