Tue Aug 04 2026

Low temp indicator on

How to resolve low temp indicator

Equipment: HELMER - HLR125


   RE: Refrigerator, Blood Bank Report Post
Tue Aug 04 2026Reply from MapleTreeBiomed
MapleTreeBiomed

Hi Samuel Ofei, 

Do you have any way of verifying the temp inside the chamber? We would need to verify if the fridge is actually getting that cold before making any changes. The service manual in the documents section talks about setting the low temp alarm on page 55. The default is  1.5 °C for the blood bank model and  2.0 °C for the other models. Adjusting the calibration of the internal thermometer is on page 56 in case that is off. Always measure the temp as close to the internal sensor as possible. I unusually wrap a thermocouple around the glycol bottle and let it normalize for 15 minutes at least. 

Good Luck!


Andrew Whyte, CBET, Maple Tree Biomedical LLC
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Wed Aug 05 2026Reply from Jlinton
Jlinton

On the Helmer HLR125, a Low Temp alarm simply means the cabinet temperature has dropped below the low alarm setpoint.

I'd check:

  • Verify the actual temperature with an independent thermometer.
  • Check the low temperature alarm setting.
  • Make sure the door isn't staying closed for long periods causing overcooling.
  • If the temperature is truly too low, check the temperature sensor and the refrigeration control board.

If the displayed temperature is normal but the alarm remains, I'd suspect a temperature sensor or calibration issue.


James Linton, MiM, PmP, Cmbb, AAMIF
Biomedical Engineering Technology

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