Our NF1750 keeps powering down every 15 minutes or so. The Procom software doesn't detect the fan spinning on the processor, even though the fan IS spinning. Switching to the other processor slot has been tried as well to no avail.
Has anyone had an experience with this? Is it a motherboard failure or something else?
Check the internal sensors. There were 2 of them that sensed the internal temp of the system. the one in front sometimes would break. Those units also had a smart card that did all the montoring. Its the only isa card in the system. It can cause these weird problems.
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Malfunction of Outdoor Unit Fan Motor (
Abnormality of fan motor system is detected according to the fan speed detected by hall IC when the
fan motor runs.
When the fan runs with speed less than a specified one for 15 seconds or more when the fan motor
running conditions are met
When connector detecting fan speed is disconnected
When malfunction is generated 4 times, the system shuts down.
?? Malfunction of fan motor
The harness connector between fan motor and PC board is left in disconnected, or faulty connector
Fan does not run due to foreign matters tangled
Clearing condition: Operate for 5 minutes (normal)
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
Replace the outdoor unit fan motor.
Connect the connector.
Remove the foreign matter.
Are fan motor
Replace the outdoor unit fan motor.
Is the pulse input?
Check No. 11
Check for pulse input
for number of rotations
on the outdoor unit
Replace the outdoor unit PC board.
any foreign matter
around the fan?
Can the fan be
easily rotated by hand?
Hi David, thank you for your inquiry. I understand that your Frigidaire Refrigerator is cycling on and off more than you expected. Todays newer refrigerator's have to meet Dept of Energy (DOE) specifications for energy savings. Typically the fan and compressor runs to get the fresh food temp down to 34*, the compressor shuts off and the fan runs for thirty more minutes and shuts down. The fan will repeatedly cycle on and off to keep the temp down as close to 34*. Once the temp in the fresh food hits 40* for more than two minutes the compressor cycles back on again. This will cause the temps in the fresh food to dwell between 35-40 and in the freezer section between 8-15. Hope this helps! -JK
if you haven't tried this,unplug the power or shut the circuit breaker off for 15 minutes,this may reset the defaults on the unit,if this doesn't help,then shut off power to the unit and open up unit and disconnect each and every connector to check for poor conduction,then reconnect power,if this doesn't help then replace the c.c.u. central control unit
The outside and inside coils may need cleaning. Clogged coils cause excess pressures and heat of the freon that can cause safety switches to shut er down. Eveen a faulty power relay in the outside unit.Otherwise you may need a serviceman to locate the cause.
If new RTS2 is not working, then either the wire to HRV/ERV system is suspect, unit is not getting power, or the HRV/ERV system is suspect. If you are using RTS2 for ordinary ceiling fan, then install regular on-off switch and see it that works. Check that you are getting power to switch and to fan. Check circuit breaker.
Protect mode will kick in whenever a fault is detected.
You get the unit not powering up, and sometimes you hear a clicking
noise, that is the protection switch that keeps shutting down the unit.
Causes that can start protect mode are:
Electrostatic harges on internal circuits.
Leave the unit unplugged for power for one hour or so, this will allow discharge.
Bad speaker wiring.
Check speaker wiring, try unplugging and plugging back, or start after removing one speaker at the time.
fault is the natural cause for protect mode. If all the above did not
work, then the problem is a blown component or an internal fault. In
this case the unit must be taken apart , tested and repaired by an
If the unit is less than one year old, or if you
want to get service, call Sony at the phone number listed on the