STIEBEL ELTRON IS E Bedienungsanleitung

Service Manual

IS_E / IS_E-2

Author: Mr. Apiwat Limrueangwattanakul

Date: 25 March 2013

Revision: version 1.0

Table of Contents

Warning.......................................................................................................................................................... 3

General product information......................................................................................................................... 4

Technical data ................................................................................................................................................ 5

Wiring Diagram .............................................................................................................................................. 6

Troubleshooting............................................................................................................................................. 7

Root clause analysis ....................................................................................................................................... 9

1. Heating Elements checking................................................................................................................ 9

2. TRIAC checking ............................................................................................................................... 10

3. Flow Switch checking ...................................................................................................................... 11

4. PCB Control checking ....................................................................................................................... 13

5. Thermostat checking ...................................................................................................................... 13

6. System comfirm ............................................................................................................................... 15

Warning

Warning: This service manual is suitable for qualified Technicians only.

Warning: Disconnect power supply before open cover.

General product information

The Stiebel Eltron IS pressureless (open) instantaneous water heater is a device for

heating water for shower. The electrical power is electronically controlled. The unit switches the

power on once the flow volume reach 1.5-2 l/min.

The “Power” light (C) indicates that the unit is switched on. If the temperature

adjustment rotary (B) switch is turned to the left, it is possible to take a cold shower (the heating

will not be switched on).

The IS is fitted with an overheating protection device. In the event of overheating the

heating power will be cut off.

Technical Data

Model

IS 35E/E-2

IS 45E/E-2

IS 60E/E-2

Type

Opened outlet

Water pressure

0 Mpa (0 bar)

Water connection

G 1/2" (external thread)

Electrical connection



220 V

3.5

4.5

6.0

230 V

3.8

4.9

6.6

240 V

4.2

5.4

7.1

Recommended cable size Sqmm.

4.0

6.0

Recommended circuit breaker A

Min flow rate to active unit (L/min)

1.3 ± 0.3

2.2 ± 0.3

Thermostat (TCO)

DOUBLE ACTION (55 °C / 75 °C)

Dimension (W x H x D) mm.

350 x 210 x 100

Wiring Diagram

Type IS...E / IS…E-2

A = Heating element

B = Electronic control set

C = ELSD Circuit

D= Single Triac Set

E = Thermal cut - out (TCO)

F = Button Board

G = Current Leakage Sensor

Type IS…

A = Heating element

B = Electronic control set

D = Single Triac Set

E = Thermal cut - out (TCO)

Troubles shooting

- ELSD cut-off

- Check filter, and flow

rate

-Low flow

- No power supply to unit

- Power line not tight

- Check breaker

- Thermal cut-out (TCO)

- Check Triac set

- Check Reed switch

- Cleaning magnet

- Check PCB

- ELSD reset

- Check connecting

points and fix.

Power lamp not "ON"

and water not hot

- PCB failure

- Check PCB

- Missing water connection

- Check reed switch

- Reed switch failure

- Check Triac set

- Triac failure

Problem & Condition

Cause

Correction

- Reconnect inlet,

outlet

Power lamp "ON"

but water not hot

- Heating elements failure

- Check Heating

element

Power lamp not "ON"

but water Hot

- Lamp broken

- Lamp cable broken

- Check & change the Lamp

- Check & change Lamp

cable

Power lamp "ON" all the

time

- Reed switch failure

- Check reed switch

- Triac short circuit

- Check Triac set

Problem & Condition

Cause

Correction

- Overloaded current on main

breaker

- Power line wrong connection

- Turn off other appliance

- Reconnect power

line

- Water over flow

- Reduce water flow

ELSD cut-off

- Reed switch failure

Water temperature

not constant

- Change pump to

smooth pressure type

- Check reed switch

- Irregular water flow

- Triac failure

- Check Triac set

Water leak

- Wrong installation

- Reinstallation

- Connector has loosen

- Tight connectors

- PCB failure

- Check PCB

Power on maximum but

water not hot enough

Water too hot

Troubles shooting

Root clause analysis

1. Heating Elements checking

Definition: Heating Element is a metal coil that heats up to high temperatures, when

electricity is applied. To check the Heating Element, follow the steps below:

- Disconnect cables from the Elements.

- )))) "and check as show in the pictures.

Check

Meter Result

Cause

Action

Pole Pole

"Beep" signal or (~ 0 )

Element Pass

No action

No signal "OL" or 

Element Broken

Change New Heater

Pole GRD

"Beep" signal or (~ 0 )

Element short to tank

Change New Heater

No signal "OL" or (∞

Element Pass

No action

Remark: "OL" = Over Load for Digital Multimeter, "∞Multimeter

Pole Tank (P1 - Tank) or (P2 - Tank), (GRD - Tank)

Pole - Pole (P1 - P2), (P1 - GRD) or (P2 - GRD)

IS 60E/E-2

IS 35E/E-2, 45E/E-2

GRD

Tank

IS 3E/E-2, 45E/E-2

IS 60E/E-2

GRD

Tank

2. TRIAC Checking

Definition: The Triac is a three-terminal device, which controls and conducts current flow during

both alternations of an AC cycle. To check Single Triac, follow the steps below:

- Disconnect cables and unplug any connectors in red circle.

- )))) " and check as show in the pictures.

Note; L1 = line, H1 = Heater, GRD = Ground

Check

Meter Result

Cause

Action

L1 H1

"Beep" signal or (~ 0 )

Triac short circuit

Change new

No signal "OL" or (∞

Triac Pass

No action

Check

Meter Result

Cause

Action

L1 - GRD

"Beep" signal or (~ 0 )

Triac short circuit

Change New Triac PCB

No signal "OL" or (∞

Triac Pass

No action

H1- GRD

"Beep" signal or (~ 0 )

Triac short circuit

Change New Triac PCB

No signal "OL" or (∞

Triac Pass

No action

Remark: "OL" = Over Load for Digital multimeter, "∞ultimeter.

GRD

Poles - Ground

GRD

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