OJ ETO2, User Manual, Page: 21 / 96

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© 2011 OJ Electronics A/S
If the ALARM button flashes red, one of the following errors has occurred. This can be displayed under the
menu: ALARM.
"RETURN TEMP LOW" - Water temperature on return pipe is too low.
"SUPPLY TEMP HIGH" - Water temperature on supply pipe is too high.
"RETURN SENSOR" - Return sensor defective.
"SUPPLY SENSOR" - Supply sensor defective.
"TEMP SENSOR 1" - Temperature sensor in ground or roof sensor 1 defective.
"TEMP SENSOR 2" - Temperature sensor in ground or roof sensor 1 defective.
"OUTDOOR SENSOR" - Outdoor sensor defective.
"SENSOR HEATER" - Short circuit of heating element in ground or roof sensor.
"FROST PROTECT" - Active frost protection due to low return temperature
(waterbased systems only)
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ETO2
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