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26 94-RTH-BA.D/12.05
8 Fehlersuche
8.1 Thermostat Typ 4250 und 4251
Fehler: Grosse Temperaturschwankungen im Raum (6 bis 8 K)
Ursache Behebung
Neutralleiter nicht am Gerät angeschlos-
sen
Neutralleiter korrekt anschliessen (siehe
Schema Kapitel 7, Seite 22)
Neutralleiter nicht am Verteiler ange-
schlossen
Fehler: Raum wird nicht warm
Ursache Behebung
Nur für 4251: Netzschalter nicht einge-
schaltet
Netzschalter in Stellung I bringen
Keine Betriebsspannung am Thermosta-
ten vorhanden
Sicherung und Verdrahtung überprüfen
Es steht kein Warmwasser zur Verfügung Brenner überprüfen
Stellantrieb nicht richtig befestigt Stellantrieb richtig befestigen
Stellantrieb defekt (Ventil öffnet nicht) Stellantrieb durch Fachperson ersetzen
lassen
Im Thermostaten befindet sich grober
Bauschmutz
Sicherung ausschalten, Frontplatte ent-
fernen und Gerät reinigen
Thermostat defekt Thermostat ersetzen
30


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