OJ Electronics ETO2 Instructions page 58

English / User Manual
o Check heating cables for defects and bad or incorrect connections.
o It may be too cold for snow melting (insufficient power/m2), i.e. the heating cables or
hydronic heating system is undersized.
NO:
o The temperature is higher than SET TEMP. Adjust SET TEMP to higher temperature.
o The snow around the ground sensor has melted or drifting snow has exposed the sensor.
Increase AFTERRUN time or activate FORCE HEAT.
o An igloo effect has occurred around the sensor. The ground sensor has melted an insulated
cavity under the snow.
Activate FORCE HEAT or set MOIST CTRL to OFF.
o The temperature is lower than the OFF TEMP setting.
Depending on heat output, the system may have a lower temperature limit at which snow can
be melted.
Try melting the snow with FORCE HEAT before changing the OFF TEMP.
Heating is not shut off after ice/snow melting
o AFTERRUN time is too long – reduce AFTERRUN time and activate RESTART in the menu.
o Moisture detection in the ETOG/ETOR sensor is turned off – set MOIST CTRL to ON in the
menu.
If the red ALARM button flashes, one of the following faults has occurred. The relevant message will be
displayed in the ALARM menu.
"RETURN TEMP LOW"
"SUPPLY TEMP HIGH"
"RETURN SENSOR"
"SUPPLY SENSOR"
"TEMP SENSOR 1"
"TEMP SENSOR 2"
"OUTDOOR SENSOR"
"SENSOR HEATER"
"FROST PROTECT"
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- Water temperature in return pipe is too low.
- Water temperature in supply pipe is too high.
- Return sensor defective.
- Supply sensor defective.
- Temperature sensor 1 (ground or roof) defective.
- Temperature sensor 2 (ground or roof) defective.
- Outdoor sensor defective.
- Heating element in ground or roof sensor short-circuited.
- Frost protection active due to low return temperature.
(hydronic systems only)
© 2020 OJ Electronics A/S
Type ETO2