Bosch DOMESTIC HOT WATER HEAT PUMP User Manual download pdf (Page 21)

ERROR MANAGEMENT

6 720 642 344 (2010/01)

8.5 ALARM WINDOW

8.5.1 TRIPPED LOW PRESSURE SWITCH

Fig. 49

POSSIBLE CAUSE 1: EVAPORATOR BLOCKED.

B Clean evaporator (Æ chapter 7.5).

B Select Acknowledge.

B Wait until the heat pump starts again.

B Notify customer service if the alarm occurs frequently.

POSSIBLE CAUSE 2: FAN BLOCKED.

B Remove debris that blocks the fan.

B Select Acknowledge.

B Wait until the heat pump starts again.

B Notify customer service if the alarm occurs frequently.

Possible cause 3: Refrigerant circuit fault.

B Select Acknowledge.

B Wait until the heat pump starts again.

B Notify customer service if the alarm occurs frequently.

8.5.2 TRIPPED HIGH PRESSURE SWITCH

Fig. 50

POSSIBLE CAUSE 1: AIR IN THE HEATING SYSTEM.

B Select Acknowledge.

B Check whether air is in the heating system.

B Fill the heating system and vent if required.

POSSIBLE CAUSE 2; BLOCKED PARTICLE FILTER:

B Select Acknowledge.

B Check filter.

B Clean filter if required (Æchapter 7.4).

POSSIBLE CAUSE 3: INADEQUATE FLOW RATE

ACROSS THE HEAT PUMP.

B Select Acknowledge.

B Check whether the primary heating circuit pump has

stopped.

B Check whether all valves are open. In a heating

system incorporating thermostatically controlled

valves, these valves must be fully open. In underfloor

heating systems, at least 50% of all heating loops

must be open.

B Where appropriate, select a higher speed for the

primary heating circuit pump.

B Notify customer service if the fault continues to occur.

8.5.3 FAILURE / SHORT CIRCUIT ON SENSOR

Fig. 51

All sensors connected to the heating installation can give

an alarm in the event of a fault. In the example, it is

sensor T3, hot water, which has given an alarm. All

sensors give alarms in the same way.

PROBABLE CAUSE 1; TEMPORARY FAULT:

B Wait.

PROBABLE CAUSE 2; DEFECTIVE SENSOR OR

INCORRECT CONNECTION:

B Notify customer service if the fault continues to occur.

8.5.4 FAULTY FUNCTION IN 4-WAY VALVE

Fig. 52

POSSIBLE CAUSE 1: 4-WAY VALVE FAULTY.

B Select Acknowledge.

Notify customer service if the alarm occurs frequently.

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Bosch DOMESTIC HOT WATER HEAT PUMP User Manual Page 21

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