# True TUC-27F: Used-Buy Risk, Repairs & What to Check | KitchenRisk > Used True TUC-27F buying guide, mechanical temperature control risk, repair costs and what to inspect. **Verdict:** inspect Common workhorse undercounter freezer with active OEM parts support (temperature control kit ~$358, defrost termination switch ~$207); True's manual describes the compressor cycling directly off the temperature control dial and a timed defrost cycle that depends on the evaporator coil reaching a set temperature or a timer expiring, and separately warns that dirty condensers (required cleaning every 30 days) cause compressor failure, so verify the unit cycles on/off correctly, completes a full defrost, and holds temperature under load before buying used. **Documented failure risks:** - Mechanical temperature control: OEM temperature control kit (True 800345, 077B1264) lists at $357.93 on Parts Town and appears directly in the TUC-27F model's parts catalog. Per True's IOM, on mechanical-control freezers "the compressor only will start if the temperature control is calling for cooling. (If the compressor does not start, verify that the temperature control is not in the 'OFF' or '0' position...)" -- a failed or miscalibrated control is a direct cause of a cabinet that won't cool or won't cycle off. - Defrost termination switch: OEM defrost termination switch (True 850827, 37T21) lists at $206.83 on Parts Town. True's IOM describes the defrost sequence: "the compressor and evaporator fan(s) will turn off and the evaporator coil heater and drain tube heater will be energized... After the predetermined evaporator coil temperature has been reached or duration for defrost has expired, the compressor will restart." The manual does not name this switch by part number, but this is exactly the temperature-sensing function it performs; a failed unit can leave the freezer stuck in defrost (heater running, no cooling) or end defrost early, leaving frost buildup. - Condenser coil: True's IOM states: "Condensers accumulate dirt and require cleaning every 30 days. Dirty condensers result in compressor failure, product loss, and lost sales." Verify the condenser is clean during inspection, since this is True's own documented leading precursor to compressor failure across its refrigeration line. ## Sources - [True 800345 Temperature Control Kit, 077B1264 | Parts Town](https://www.partstown.com/p/true/true800345) — "data-price="357.93" data-list-price="357.93" ...

True 800345 Temperature Control Kit, [077B1264] ... Manufacturer #: 800345 ... Parts Town #: TRUE800345" - [True 850827 SWITCH, DEFROST TERMINATION 37T21 | Parts Town](https://www.partstown.com/p/true/true850827) — "data-price="206.83" data-list-price="206.83" ...

True 850827 SWITCH, DEFROST TERMINATI[ON 37T21] ... Manufacturer #: 850827 ... Parts Town #: TRUE850827" - [True Undercounter and Worktop Freezers Installation and Operation Manual (body text names model TUC-27F; filename covers sibling TUC47F/48FD4/TWT44F/67F models)](https://www.partstown.com/modelManual/TRUE-TUC47F-48FD4-TWT44F-67F_iom.pdf?v=1706043190293) — "You have just purchased the finest commercial freezer available. TUC-27F ... TUC-27F/27DI/27WB/36-34/48DI/48WB/72 ... The compressor only will start if the temperature control is calling for cooling. (If the compressor does not start, verify that the temperature control is not in the 'OFF' or '0' position or the cabinet is not in a defrost event.) ... the compressor and evaporator fan(s) will turn off and the evaporator coil heater and drain tube heater will be energized... After the predetermined evaporator coil temperature has been reached or duration for defrost has expired, the compressor will restart ... Condensers accumulate dirt and require cleaning every 30 days. Dirty condensers result in compressor failure, product loss, and lost sales." _Last verified 2026-09-20. Source: KitchenRisk — https://kitchenrisk.com/models/true-tuc-27f/ — every claim checked against a primary source before publication (see /methodology/)._