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Bosch 715ES Service Bulletin

Replacing gas valve.
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Service Bulletin G3-28
Models: 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES
Replacing gas valve
Introduction
This procedure must be performed by a licensed gas technician
with a calibrated combustion gas analyzer.
The gas valve is not gas type specific but requires different CO₂
values when calibrating for different gas types.
Tools needed:
Phillips head screwdriver
Small flat head screwdriver
#40 Torx driver
Combustion gas analyzer
30mm open end wrench or large adjustable wrench
4mm allen wrench
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)
Step 1
Step 1
3
Step 2
Step 2
3
4. Remove combustion cover by unclipping two upper and two
lower clips securing cover. (Fig. 1, step 2)
5. Remove 3 Phillips screws on control unit (Fig. 2, step 1). Place
control unit into the service postion by engaging its tabs with
the holes in the horizontal sheet metal on bottom of the heater
chassis . (Fig. 2, step 2).
Figure 1
Removing the gas valve
1. Unplug wire connection from gas valve. (Fig. 3, pos. 1).
2. Disconnect clear silicone pressure balance tube from right side
of gas valve. (Fig. 3, pos. 2)
3. Loosen and disconnect large 30mm hex nut on the left side of
gas valve. (Fig. 3, pos. 3).
4. Unscrew the three 4mm allen screws from the top of the gas
valve. (Fig. 3, pos. 4).
5. Remove gas valve from the water heater.
Figure 2
Step 1
Step 1
Gas
Valve
Step 2
Step 2

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Table of Contents

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   Summary of Contents for Bosch 715ES

  • Page 1 Service Bulletin G3-28 Models: 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES Replacing gas valve Introduction 4. Remove combustion cover by unclipping two upper and two lower clips securing cover. (Fig. 1, step 2) This procedure must be performed by a licensed gas technician 5.
  • Page 2 Service bulletin 18 | G3-28 | 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES Figure 3 to do so will damage the gas valve. 1. Locate adjustment screw on gas valve. Loosen Phillips head screw so retaining cover can be rotated to expose brass slotted screw.

This manual is also suitable for:

C920esC800es2400es2700esC920esc

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