WhisperKOOL COH: the condenser coil ran too hot
COH is the condenser overheat protection on SC PRO and Slimline LS through-wall units.
Mon–Sat, 8am–8pm
- Fans and airflow
- Cellar evaporator and condenser fan repair
- Source: WhisperKOOL
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Three short steps, about a minute.
or call (844) 398-5977
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What COH
actually means.
COH is the condenser overheat protection on SC PRO and Slimline LS through-wall units. When the condenser probe reaches 125°F, the controller shuts the compressor off, lights the red alarm and shows COH, and restarts normal operation once the coil falls to 115°F. The cause is almost always the hot side: a dirty condenser, intake air above 85°F or a condenser fan that has stopped.
WhisperKOOL wine cellar cooling unit display · also shown as “COH”
What to do when COH shows on the wine cellar cooling unitKind of codeFans and airflow
A fan the controller counts on is slow, noisy or stopped. On the cellar side one fan pushes cool air across the racks; on the exhaust side, or in a split system's outdoor condenser, another throws the room's heat away. A rack or a case of wine stacked against the grille, a clogged filter, a dust-caked condenser or a tired capacitor is cleared before a motor is replaced.
Usually leads toCellar evaporator and condenser fan repair
Restoring the two fans a cellar unit depends on: the one that moves cellar air across the cold coil and the one that throws the heat away.
Shows up asCellar Cooling Unit Exhaust Overheating
A cellar cooling unit exhaust overheating makes the room on the other side of the wall uncomfortably warm, blows hot air hard enough to feel from across the room, and often makes the unit stop and restart in the afternoon.
MakeWhisperKOOL
WhisperKOOL systems serviced where they are installed, whether the cellar is warming, the coil is frosting or the unit never rests.
SourceWhisperKOOL SC PRO Series owner's manual (12/2022)
SC PRO and Slimline LS through-the-wall controllers.
Before you book,
in this order.
Each step comes from WhisperKOOL's own guidance for COH on its wine cellar cooling units. Follow it to the end: the last card says whether this is a visit.
Check the room behind the unit; WhisperKOOL wants the intake air no warmer than 85°F.
Clean dust from the condenser coil and filter on the exhaust side, with the unit unplugged.
Look to see that both condenser fans spin when the unit runs.
If COH returns on a cool day with a clean coil, book a visit.
Still there?
It usually turns into cellar evaporator and condenser fan repair. Book with the code and the model number.
What not to do
COH does not mean the compressor has failed; the compressor is being stopped on purpose. Repeated COH does let the cellar warm, so the cause needs fixing.
What you may
notice with it.
The wine cellar cooling unit problems COH tends to arrive with. Answer these at the wine cellar cooling unit before anyone is booked.
All problems
Where COH usually leads
Cellar evaporator and condenser fan repair.
WhisperKOOL
wine cellar cooling units.
WhisperKOOL systems serviced where they are installed, whether the cellar is warming, the coil is frosting or the unit never rests.
WhisperKOOL wine cellar cooling unit repair
Through-the-wall cellar cooling unit
A self-contained box set into an opening in the cellar wall: its cold face blows into the wine room, and its warm face breathes out into the room next door.
Ducted cellar cooling unit
A self-contained cooling unit placed outside the cellar, in a mechanical room, attic or basement, that sends chilled air in and takes return air back through insulated ducts.
Split-system cellar cooling
An evaporator inside or beside the cellar and a condensing unit outside or in another room, joined by an insulated copper line set and charged on site.
In WhisperKOOL's own words
The condenser coil temperature is above 125°F
Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. SC PRO and Slimline LS through-the-wall controllers.
WhisperKOOL COH wine cellar cooling unit repair,
where we come out.
The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered.
All service areasTampa BayFL · 31 areas
Miami / South FloridaFL · 47 areas
New York MetroNY · 75 areas
HoustonTX · 36 areas
ChicagoIL · 50 areas
Los AngelesCA · 95 areas
San DiegoCA · 31 areas
Questions
about COH.
Can I clear COH myself?
Why does my WhisperKOOL SC PRO show COH only in summer?
How many condenser fans does a WhisperKOOL SC PRO have?
Will COH damage my WhisperKOOL?
Back to your everyday
Still showing COH?
When you book, type the code or the blink count as the controller shows it, add the full model number, and say what the thermometer in the cellar reads now — that gives the technician a head start.