Bosch Evolution 500 Бюллетень технического обслуживания

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Bosch Evolution 500 Бюллетень технического обслуживания

Technical Service Bulletin:

A2 Error Code Troubleshooting

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.

Follow the procedures below and report results to Bosch Technical

Support. This will assist in determining the cause and solution to the

problem.

A2 error code

This error code detected by the ﬂ ue gas limiter

exhaust leak from the combustion chamber.

Flue Gas Limiter

The ﬂ ue gas limiter is a safety device located in the upper right

corner of the heater that is designed to trip (creating an open

circuit) if the chamber outside the heat exchanger exceeds 220 °F or

104 °C.

The limiter will reset itself (closing the circuit) when it cools off, but

the error will still have to be reset manually using the reset button

on the control board.

Tools needed:

Phillips head screwdriver



Digital Multi-meter



Procedure

Press the "reset" button on the control panel of the

heater to clear the error code. If the error code does not

reset or continues to reoccur, proceed with the following

troubleshooting steps.

Conﬁ rm that the heater is installed according to the

speciﬁ cations in the manual.

Confirm that the exhaust and intake pipes are the correct



diameter, material and approved length as explained in the

installation manual provided with your model.

Remove cover per the installation manual and verify that the

plug connector between the ﬂ ue gas limiter (white wires) and

the control unit (black wires) is ﬁ rmly connected (see Fig. 1).

indicates a possible

The ﬂ ue gas limiter (see Fig. 2 A) should not be confused

with the overheat sensor (ECO) on the upper right corner

of the heat exchanger (see Fig. 2 B). The ECO serves an

entirely different function and prompts a different – E9 –

error code.

Figure 1

Figure 2