25
5
LAMP
OPTIMA DM(DMF)
OPTIMA EST
Description
Malfunction of the pressure switches
Cause
&
Remedy
1) Pressure switch error
→ Thaw the machine completely and
reset the machine. If the problem
persists, replace both pressure
switches.
2) Malfunction of the water
probe sensors
→ Clean scale build-up from the tip of
the water probe sensors with sand
paper or replace if necessary.
6
LAMP
OPTIMA DM(DMF)
OPTIMA EST
Description
Water pump over-running
Cause
&
Remedy
1) Water filter clogging
→ Check or replace the water filter.
2) Malfunction of the water
pump
→ Check or replace the water pump.
3) Malfunction of the water
probe sensors
→ Clean scale build-up from the tip of
the water probe sensors with sand
paper or replace if necessary.
7
LAMP
OPTIMA DM(DMF)
OPTIMA EST
Description
Temperature detection of the Thermistor Temp. Sensor triggered in
subzero temp. (below 0℃/32℉) or high temp. (above 200℃/392℉).
Cause
&
Remedy
1) Subzero temp. detection
after experiencing freeze
damage to the machine
→ Thaw the machine completely and
reset the machine.
2) Malfunction of the
thermistor(temp.sensor)
→ Replace the thermistor temp. sensor
3) Malfunction of the
pressure switches
→ Check the pressure switches and
replace if necessary