Bosch HP270-2 Technical Manual page 52

Failure in low pressure side due
to insufficient refrigerant gas flow
Expansion valve is
correctly assembled and
bulb insulated?
Dry filter is saturated /
Refrigerant circuit with
insufficient charge ?
Expansion valve blocked
or without gas in bulb?
Note: In new software version, in case of E09, the electrical heater is automatically switched ON to ensure a
minimum of 40ºC in tank until technician intervention (even if appliance is in HP or combi). Always do reset to error
before start troubleshooting as e-heater cable could be energized if T top < 40ºC.
Code HOT – Warning Code
Temperature of air admission is higher than + 35ºC.
Self Reset error after normal temperature conditions are reached (control unit checks temperature 1 hour
1
after the code display)
Code COLD – Warning Code
Temperature of air admission is lower than + 5ºC or - 10ºC according to the model.
Self Reset error after normal temperature conditions are reached (control unit check temperature 1 hour after
1
the code display)
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Yes
Yes
blocked?
No
No
Yes
Detect leakage / Repair circuit /
Charge 400 gr of gas R134a
6-720-821-364 SM HP270 – 250 - 200 2016/12 en
No
Correct position and ensure
insulation is correctly assembled
Measure inlet / outlet
temperature (should be +/- the
same)
Yes
Low charge leads to reduced
evaporation temperature
Low thermal power can as well be due to low water flow
/ obstruction without E09 lock out – check condenser
plate heat exchanger