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Mixed water temperature 

fluctuates

Mixed water temperature 

too high after extended 

periods of no tapping of 

water

Mixed water temperature 

too low after extended 

periods of no tapping of 

water

Mixed water cannot be set 

to the desired temperature

JRGUMAT does not 

regulate the mixed water 

temperature

Very low / no volume flow of 

the mixed water

Installation instructions/schematic 

disregarded,

back flow preventer defective

Mixed water circulation only looped back 

to water heater and not to the JRGUMAT / 

circulation not calibrated

Mixed water circulation only looped back 

to the JRGUMAT and not to the water 

heater / circulation not calibrated

JRGUMAT with inappropriate temperature 

range installed

JRGUMAT thermostat overheated

Inappropriate / no original GF JRG unions 

use

Adjust installation according to instructions, 

check proper function of back flow preven-

ter and replace it if necessary

Integrate JRGUMAT into circulation / 

calibrate circulation

Integrate water heater into circulation / 

calibrate circulation

Check temperature range of installed 

JRGUMAT; install JRGUMAT with alternative 

temperature range if necessary

Replace JRGUMAT

Use original GF JRG unions

Adhere to instructions in JRGUMAT manual; 

regularly check whether back flow preventer 

works properly

Observe the installation instructions in the 

JRGUMAT manual; split circulation: about 

10% to the water heater and about 90% to the 

JRGUMAT

Observe the installation instructions in the 

JRGUMAT manual; split circulation: about 10% 

to the water heater and about 90% to the 

JRGUMAT

Determine mixed water temperature and 

respective temperature range before ordering 

the JRGUMAT

When using soldered unions, remove 

JRGUMAT before soldering; note maximum 

temperature JRGUMAT may be exposed to

Order original GF JRG unions together 

with the JRGUMAT.

Do not use water meter unions.

!

 

Malfunction

Possible cause

 Possible action

 

Precaution

JRGUMAT – Trouble shooting 

 

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Für nicht erwähnte Störungen oder weitere Fragen stehen Ihnen unsere technischen Berater gerne zur Verfügung:

CH und Export:   Georg Fischer JRG AG, Hauptstrasse 130, 4450 Sissach, Phone Technischer Kunden41 (0)61 975 23 77

Deutschland:  

Georg Fischer GmbH, Daimlerstrasse 6, 73095 Albershausen, Phone +49 (0)7161 302 0

Österreich:  

Georg Fischer GmbH, Sandgasse 16, 3130 Herzogenburg, Phone +43 (0)2782 856 43 0

Frankreich:  

Georg Fischer SAS, Bâtiment Les Rabelais, Paris Nord 2, 22 avenue des Nations, 95932 Villepinte, Téléphone +33 1 41 84 68 84

Änderungen und Irrtümer vorbehalten.

37 201 62 / e / 05.17

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