Bosch 715ES Service Bulletin

Replacing the attenuator

Hide thumbs Also See for 715ES:

Service Bulletin G3-29

Models: 715ES, 2400ES, 2700ES

Replacing the Attenuator

Introduction

Bosch Thermotechnology recommends the following water



heater adjustments to accomodate installations with a broader

range of operating conditions and to improve operation with

varying characteristics of LP gas combustion.

Tools needed:

Phillips head screwdriver



Preparation

1. Unplug the water heater power supply cord.

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 secondary combustion cover by unclipping two upper

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

Step 1

Removing the attenuator

1. Locate attenuator. (Fig. 2, pos. 1).

2. Remove three Phillips head screws from attenuator.

(Fig. 2, pos. 2)

Figure 1

Step 2

3. Pull attenuator free from heater. Discard the black o-ring

positioned between the fan assembly and attenuator.

(Fig. 3, pos 1.)

Figure 2

Page 1 Models: 715ES, 2400ES, 2700ES Replacing the Attenuator Introduction Removing the attenuator Bosch Thermotechnology recommends the following water 1. Locate attenuator. (Fig. 2, pos. 1).  heater adjustments to accomodate installations with a broader 2. Remove three Phillips head screws from attenuator.
Page 2 Service bulletin 18 | G3-29 | 715ES, 2400ES, 2700ES 3. Release the program ( ) button when '188' appears on the Figure 3 display. The display should read 'P2'. If not, repeat process. (Fig. 4) 4. Press the ( ) button on the control panel until the display reads 'P1'.