On legacy Sub-Zero 600 Series units like the 650/F and 690, plus 700 Series, 736 and IC-27 models such as the 736TCI, code 40 means excessive freezer compressor run. Typical triggers are a door left ajar,…
On legacy Sub-Zero 600 Series units like the 650/F and 690, plus 700 Series, 736 and IC-27 models such as the 736TCI, code 40 means excessive freezer compressor run. Typical triggers are a door left ajar, a dirty condenser, or problems with the sealed system, a fan or a temperature sensor. On the 648PRO, code 40 refers to excessive compressor run for the zone shown. If temperatures are near normal, the code can be cleared by holding the bell key for 15 seconds.
1) Make sure all doors close fully. 2) Clean the visible grille. 3) Check the displayed temperatures. 4) If they are near normal, hold the bell key for 15 seconds to clear code 40. 5) If it returns, schedule service.
Not necessarily. It means the compressor ran longer than expected. Door seals, dirty condensers and fans are common causes, though a sealed system issue is possible and worth ruling out.
On the 648PRO it means excessive compressor run for the zone shown. The 648PRO also has a separate code 41 for that zone's compressor and wiring.
Yes, by holding the bell key for 15 seconds when temperatures are close to normal. If it comes back, call us for a written estimate.
A technician diagnoses it on site and gives you the price in writing before any work starts.
