Unfortunately, as technology changes so does the ability to service older models. ZZW, F-90, F-90H, D-10 meters are no longer serviceable. Learn more about new systems by visiting our Product page, or contact us for details.
No. The unit will read both temperatures and become confused.
EEE means there was a loss of signal between the outside unit (OU) and the inside unit (IU). Occasionally the signal will drop and this is normal. However, EEE for more than 15 min per occurrence and more than 3 times a day is abnormal.
Loss of signal can happen for a number of reasons but usually its power or reception related.
This means the main logic board has malfunctioned and the IU needs servicing. Please send the IU in for service and the unit will be repaired with 1 week.
bbb means the batteries are low and need to be replaced.
The algorithm used to calculate degree days is much more complicated than the High-Low method and slight variation to what is expected is normal.
If the unit is displaying EEE, the unit will calculate incorrect Degree Days. Read “My Outside Temperature reads EEE” above for help.
Advances of more than 100 DD per day are not normal and indicates there is a problem with the IU’s main logic board and needs servicing.
Please send the IU in for service and the unit will be repaired with 1 week.
(note: this is different than missing characters)
Sometimes overtime the LCD connector needs cleaning. Please send the IU in for service and the unit will be repaired with 1 week.
(note: this is different than faded display)
The display will not stop at zero (0000) if BACK is pressed and will display 7748 as negative 1 and continue to count down until the 7 turns into ‘h’. This is mentioned on page 5 of the owner’s manual in between bullets 6 & 7 of the screen guide.
The unit will only count DD’s on screen 1, 7, & 8.
All parts are available with estimated delivery times of 1 week.
Email firstname.lastname@example.org with exact description of issue and full contact information and we will respond within 24 hours.