Bosch 830ES Technical Service Bulletin

Technical Service Bulletin:
Replacing Primary Fan & Main Burner
Models: C1210ESC, C1210ES, C1050ES, C950ES, 940ES, 940ESO, 830ES, 2400ES,
2700ES, 715ES, C800ES, C920ES/ESC, Integra 500, Evolution 500
Introduction
This procedure must be performed by a qualifi ed technician.
Tools needed:
 Phillips head screwdriver
 30mm open end wrench or large adjustable wrench
 8mm open end wrench
Preparation
1. Use the power button on the front of the water heater to turn
the appliance off and then unplug from the electrical outlet.
Isolate the gas supply to the water heater by closing the
installer supplied gas shut-off valve.
2. Shut the inlet and outlet water supply off to the water heater
3. Drain the water from the water heater.
4. Loosen two Phillips head screws located at bottom rear of
cover. (Fig. 1, step 1).
5. Lift front cover upward and remove. (Fig. 1, step 2).
Step 1 Step 2
20644956-11.1V
Step 3Step
1
Step
2
2
0
6
44
9
56
-
11
.
1
V
Step
3
Figure 1
6. Remove combustion cover by unclipping two upper and two
lower clips securing cover. (Fig. 1, step 3)
7. 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).
Step 2
Gas
Valve
S
te
p
2
Ga
s
V
a
l
ve
Figure 2

Bosch 830ES Specifications

General

Voltage	240V
Frequency	60 Hz
Minimum Activation Rate	0.4 GPM
Temperature Range	140°F
Activation Flow Rate	0.4 GPM
Type	Electric Tankless
Capacity	Tankless
Safety Features	Overheat protection
Warranty	5 Years
Phase	Single Phase