I have an omnilogic system and my water (and air) temp seems like it is always reading 78degs. I thought maybe the water sensor was bad, so I just swapped it out but the system still just reads 78degs. I had not noticed the air sensor was also reading 78degs till just now. Has anyone seen an error like this before? My assumption at this point is something is wrong with the board for the unit somehow and its not getting a good reading. Any advice?
Hayward Omnilogic Temperature Not Changing
- Thread starter davidl81
- Start date
- Jul 21, 2013
- 64,891
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
What happens when you disconnect the air or water temperature?
Show us pictures of the Omni board.
Test the sensors using a multimeter as described in Temperature Sensors - Further Reading
Show us pictures of the Omni board.
Test the sensors using a multimeter as described in Temperature Sensors - Further Reading
Okay,
When I disconnect the water temp sensor I get an error on OmniLogic the the water sensor is open. Also it stops showing a temperature. This is a brand new water temp sensor (put it in today) because the old one was also having issues.
When I disconnect the water temp sensor I get an error on OmniLogic the the water sensor is open. Also it stops showing a temperature. This is a brand new water temp sensor (put it in today) because the old one was also having issues.
- Jul 21, 2013
- 64,891
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Test the sensors using a multimeter as described in Temperature Sensors - Further Reading
Tell me what resistance each sensor tests at.
Tell me what resistance each sensor tests at.
Okay,
Pool probe reads right at 11,900 (and I used my apple watch to read the water temp and it shows 68 degs), and the air probe was at 14,000 and it is 63 degs outside. If I am reading the chart correctly it looks like the probes are good, which then leads me down a rabbit hole of probably the actual omnilogic itself?
Disconnect the sensor wires from the green block.
Unplug the green block and plug it back in.
Verify the wire for each sensor goes to the correct sensor.
Reinstall each sensor individually to see if it works.
Unplug the green block and plug it back in.
Verify the wire for each sensor goes to the correct sensor.
Reinstall each sensor individually to see if it works.
Did you check the Solar Temperature Sensor?
Does the Solar Temperature give a reading?
Does the Solar Temperature give a reading?
The one that is red and white (as opposed to red and black) is the new replacement probe I installed the other day (when this problem started I just assumed that the water probe went bad). I'll check again, but fairly sure the green block is soldered onto the omnilogic board, but I could be wrong. I am 100% certain that the wires are currently installed correctly. I did disconnect the water temp and the air temp and reinstall each one separately to see what it would do. When I disconnect the air temp the unit goes into freeze protect mode because it thinks the temp has dropped. When I reinstall the air temp probe it goes back to showing 78degs of air temp. When I disconnect the water temp it just shows no reading for water temp, then gives me an error for open water temp sensor. When I re-install it I then get the same 78deg reading. I did not check the solar probe though.
Yes, you are correct it was not soldered. I turned off the unit, disconnected the sensors and unplugged the green box. No signs of damage or corrosion on the pins. Reinstalled each sensor individually and it's still the same thing, both the air and the water are showing 78degs on the omnilogic (I do not know where to check the solar temp).
Disconnect the Solar Temp Sensor.
Check each set of terminals for DC voltage with the Sensor connected and with it disconnected.
Disconnected the solar probe and checked its resistance. It measured right at 13,000, and right now its 67 outside so appears to be working. Disconnecting the solar probe did not appear to make any difference to either the air or water temp readings. All three terminals measure right at 3.28V with the probes connected, and 1.77V with the probes disconnected.
I honestly appreciate all of your help.
The voltage should go up with the sensor disconnected.
The voltages do not line up with the expected values.
Are those DC voltages?
Verify the meter by testing a battery.
The DC voltage of a battery should read slightly higher than the label voltage when testing a fresh battery.
Disconnect the 4 things with a red dot and recheck the voltage on the pins.
Also, make sure that the loose wire (red arrow) is not touching anything.
Also, make sure that the loose wire (red arrow) is not touching anything.
With the plugs disconnected, test for DC Voltage from red dot to green dot on the three Comm Buss pins.
3.3 volts might be correct for disconnected on OmniLogic.
Are you sure that those numbers are not reversed?
Last edited:
You are correct, I had it backwards. When connected all read 1.77V. Also all three probes read right at 10,300 on the resistance when connected. I'll go run the other traps you mentioned.