BA_GMLW OTE bis V3.4 SHORT_EN_20090408_V1 Page 17 of 25
Error / Warning Possible Cause Recommended Action
2. Energy provider error - High
Pressure (ER 36)
Energy dispersion not guaranteed /
Heating loop over-regulated
Open barriers to flow (valves)
One or more circulation pumps not
functioning
Reset function
see also Pos. 5.
RPM (speed level) of heating circulation
pump to low
Increase pump RPM (level switch), delta
t=5K, supply/return
Air in heating circuit Bleed heating circuit
3-way valve defect Replace
Return-valve does not open Loosen, replace
For external hot-water heating option:
-Heat exchanger too small Enlarge heat exchanger
-Heat exchanger chalked or silted Contact customer service, clean, decalcify
Control set too high Lower shut-off temperature (55°C maximum)
Loose connections at terminals Tighten connections at terminals
3. Energy generator error - Low
Pressure (ER 37)
Air temperature too low Activate auxiliary heat source (e.g. elec.
element)
Evaporator heavily iced, too little defrost
energy available
Enlarge buffer storage tank, install electrical
heating element with larger capacity
Refrigerant loss Contact Customer Service
Refill refrigerant
Refrigerant circuit defect Contact Customer Service
Repair or replace
Buffer pump defect Contact heating installer, free/replace pump
4. Evaporator iced despite defrost
function (ER 47)
Poor weather conditions Remove ice with the help of warm water or
air. Never remove ice mechanically
Too little defrost energy available Enlarge buffer storage tank, install electrical
heating element with larger capacity
5. Heating system not warm, heat
pump and buffer storage hot
see also Pos. 2
Energy discharge interrupted/not
sufficient
Repair or replace circulation pump,
bleed heating circuit, open gate valve, open
regulator, set circulation pump speed to a
higher level
6. Heat pump runs, but heating
capacity is insufficient
Too high heating demand Reduce heating demand
Heat source overloaded Reduce heating demand
Machine is set for boiler-priority Check hot water control settings
Building condition (e.g. insulation
properties) insufficient
Install insulation to heat pump design
conditions
Scroll-Compressor rotates in the wrong
direction. Warning: Turn of heat pump
immediately
Contact electrician to change wiring, test to
ensure proper rotation direction
7. Heat pump provides hot-water but
heating is late or non-existent
Hot water thermostat set too high Lower switch in temperature
Control is set to summer operation Set controller for heating operation
Heat exchanger (hot water) too small Enlarge surface area of heat exchanger
Heat exchanger (hot water) chalked Contact installer, clean, decalcify
Table. 3: Trouble shooting chart 1
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