180/238
Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 10 DHW heating 05.02.2007
Number Text Effect
75
DHW flow sensor sec error
Nonurgent message; must be acknowl-
edged
If the sensor is required for control (plant types DHW 3, DHW 4, and DHW 6) and no
primary flow temperature is available (plant type DHW 4), the mixing valve will fully
close.
Number Text Effect
76
DHW flow sensor cons
error
Nonurgent message; must be acknowl-
edged
The consumer’s mixing valve will fully open and no legionella function will be performed
in consumer control.
Number Text Effect
77
Faulty DHW return sensor
Nonurgent message; must be acknowl-
edged
Return temperature limitation is no longer possible.
Number Text Effect
2101
Legionella protection error
Nonurgent message; must be acknowl-
edged
This error occurs when the legionella function has not been able to reach the legionella
setpoint for 48 hours. The legionella function will be aborted and restarted only the next
time the legionella program is enabled.
Number Text Effect
2551
[DHW primary pump]
overload
Nonurgent message.
Acknowledgement can be selected;
factory setting: “Acknowledge and reset“
2552
[DHW primary pump B]
overload
Nonurgent message.
Acknowledgement can be selected;
factory setting: “Acknowledge and reset“
2553
[DHW prim pump] no flow
Nonurgent message; must be acknowl-
edged and reset
2554
[DHW prim pump B] no
flow
Nonurgent message; must be acknowl-
edged and reset
2555
[DHW primary pump] fault Urgent message; must not be acknowl-
edged. Plant stop DHW
Number Text Effect
2561
[DHW sec pump] overload Nonurgent message.
Acknowledgement can be selected;
factory setting: “Acknowledge and reset“
2562
[DHW sec pump B] over-
load
Nonurgent message.
Acknowledgement can be selected;
factory setting: “Acknowledge and reset“
2563
[DHW sec pump] no flow
Nonurgent message; must be acknowl-
edged and reset
2564
[DHW sec pump B] no flow
Nonurgent message; must be acknowl-
edged and reset
2565
[DHW sec pump] fault Urgent message; must not be acknowl-
edged. Plant stop DHW
Faulty secondary flow
sensor
Faulty consumer flow
sensor
Faulty return sensor
Legionella temperature
not reached
Faulty DHW primary pump
Faulty DHW secondary
pump
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