Bosch Evolution 500 Buletin Layanan

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Service Bulletin G3-33

Models: 715ES, C800ES, C920ES, C920ESC, 2400ES, 2700ES, Evolution 500, Integra 500

EA Error Code Troubleshooting

WARNING: This bulletin includes troubleshooting that

should ONLY be performed by a qualified professional.

Introduction

EA Error code explanation:

The unit could not establish a burner ﬂ ame signal at start up.

Typically, the unit will make several attempts to establish a ﬂ ame

before it locks out on an EA error code.

Tools needed:

Phillips head screwdriver



Manometer



Digital Multi-meter



Preparation

Remove cover from heater (see Section 2.2 in Installation Manual).

Troubleshooting

Check for spark and ﬂ ame through heat exchanger site window

(Figure 1, pos. 1) with water ﬂ owing. Ignition electodes are

located on inner left side of site window. Record observations

(e.g. Does heater spark several times and lock out? Does it

immediately go to the error code?).

Check for correct gas type on label on right side of heater

cover. The heater's gas type can also be conﬁ rmed using the

control board diagnostics feature (see installation manual). If

gas type is incorrect, heater will not operate correctly.

Make sure the unit plugged into a clean power supply (e.g.

dedicated socket on a dedicated breaker with no extension

cords, or surge protectors).

C 920 ES/ESC shown - heater design may

vary slightly depending on model

Check ground quality on electrical receptacle where appliance

is plugged in.

Is the unit installed above 2000 ft elevation? If so, was the unit

calibrated for the elevation? If not, follow the instructions in the

manual for installations at higher elevations.

Make sure there are no blockages in the combustion air or

exhaust vent piping. If the unit is drawing combustion air from

inside the building, make sure it has 50 cubic feet per 1000

BTU per hour available. For example, a 175 kBTU heater

requires 8750 cubic feet of air (175000 BTU / 50 ft³ = 8750 ft³).

Figure 1