Do you have a question about the CFF35 and is the answer not in the manual?
Questions and answers
Douglas MacMillan
April 16, 2025
My cooler is half empty and it will not build up no more colder than −2. And I gotta set of −18. Everything seems to be working.What's the problem
1 comments:
Mr. Anderson
May 9, 2025
If your Dometic CFF35 cooler is not cooling below -2°C despite being set to -18°C, possible issues could include:
1. Insufficient ventilation – The cooler needs enough space for heat to dissipate. Ensure ventilation slots are not blocked and maintain at least 50 mm of clearance around them. 2. Incorrect orientation – If the cooler is not placed as specified, internal components can be affected, reducing cooling performance. 3. Power supply issues – If powered by a starter battery, ensure the battery monitor mode is set to "HIGH". If using a supply battery, set it to "LOW". Inadequate power can limit cooling. 4. Ambient temperature – Very high external temperatures can reduce cooling efficiency. 5. Overloading or frequent lid opening – Too much warm content or frequent opening can prevent the cooler from reaching the target temperature.
CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Explanation of symbols Please read these instructions carefully and follow all instructions, guidelines, and warnings included in this product manual in order to ensure that you install, use, and maintain the product properly at all times. These instructions MUST stay with this product.
Safety instructions CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ NOTICE! Indicates a situation that, if not avoided, can result in property damage. NOTE Supplementary information for operating the product. Safety instructions DANGER! Failure to obey these warnings will result in death or serious injury.
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CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Safety instructions • Keep the ventilation openings on the device housing or in installations free of obstructions. • Do not use any mechanical objects or other means to speed up the defrosting process, unless they have been recommended by the man- ufacturer for this purpose.
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Safety instructions CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ • Opening the cooling device for long periods of time can cause signif- icant increase of the temperature in the compartments of the device. • Clean regularly surfaces that can come in contact with food and accessible drainage systems.
CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Scope of delivery • The device shall not to be exposed to rain. Scope of delivery Item in Quantity Description fig. 1, page 3 Cooler Connection cable for DC connection Connection cable for AC connection...
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• Alterations to the product without express permission from the manufacturer • Use for purposes other than those described in this manual Dometic reserves the right to change product appearance and product specifications. Function description A low maintenance refrigerant circuit with compressor provides the cooling. The generous insulation and powerful compressor ensure efficient and fast cooling.
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CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Intended use Operating and display elements Lid latches (fig. 2, page 4) Operating panel (fig. 3, page 5) Item Description Explanation Switches the cooler on or off when the button is pressed for between one and two seconds “P...
➤ To open the lid, unlatch (A). CFF35, CFF45: The lid can be opened from either side. ➤ CFF35, CFF45: To remove the lid, unlatch both sides at the same time (B). CFF12, CFF20, CFF70DZ: To remove the lid, push the lid beyond the lid stop position (B).
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CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Operation NOTICE! Damage hazard CFF35, CFF45: If the lid has been forced too far, follow the steps described in the chapter “Lid past built-in stop (CFF35, CFF45 only)” on page 21. Removing the cup holder (CFF12 only) (fig. 9, page 9) ➤...
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Operation CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ • Defrost the cooler once a layer of ice forms. • Avoid unnecessarily low temperatures. Connecting the cooler Connecting to a battery (vehicle or boat) The cooler can be operated with 12 V or 24 V...
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Restart voltage at 24 V The battery monitor mode can be selected as follows: 1. Switch on the cooler. 2. Press the “SET” button (fig. 3 5, page 5): – CFF12, CFF18, CFF20, CFF35, CFF45: Three times. – CFF70DZ: Four times.
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Operation CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ 3. Use the “UP +” (fig. 3 7, page 5) or “DOWN –” (fig. 3 6, page 5) buttons to select the battery monitor mode. ✔ Display will be as follows: Lo (LOW), ΠEd (MED), Hi (HIGH) ✔...
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2. Press the latch (fig. 2, page 4) down, until it latches in place audibly. NOTE CFF35, CFF45: When latching the lid, ensure that both latch side pins are fully engaged to ensure a good lid seal. One latch may engage slightly before the other.
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Operation CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ ✔ The cooling temperature appears in the display for a few seconds. The display flashes several times and then the current temperature is displayed again. CFF70DZ 1. Press the “SET” button (fig. 3 5, page 5): –...
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1. Switch on the cooler. 2. Press the “SET” button (fig. 3 5, page 5): – CFF12, CFF18, CFF20, CFF35, CFF45: Four times. – CFF70DZ: Five times. 3. Use the “UP +” (fig. 3 7, page 5) or “DOWN –” (fig. 3 6, page 5) buttons to set the brightness of the display.
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Operation CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ NOTICE! Damage hazard Never use hard or pointed tools to remove ice or to loosen objects which have frozen in place. To defrost the cooler, proceed as follows: 1. Take out the contents of the cooler.
CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Cleaning and maintenance 5.14 Replacing the DC plug fuse ➤ Replace the DC plug fuse as shown in fig. d, page 12. 5.15 Replacing the light PCB NOTICE! Damage hazard The lamp can only be replaced by the manufacturer, a service agent or similarly qualified person to avoid hazard.
Troubleshooting CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Troubleshooting Problem Possible cause Remedy Device does not No voltage present in Plugged in DC power outlet: In most function, LED does the connected power vehicles the ignition must be turned on not glow.
Warranty The statutory warranty period applies. If the product is defective, please contact your retailer or the manufacturer's branch in your country (see dometic.com/dealer). For repair and warranty processing, please include the following documents when you send in the product:...
Disposal CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ • A reason for the claim or description of the fault Note that self-repair or non-professional repair can have safety consequences and might void the warranty. Disposal Recycling products with non-replaceable batteries, rechargeable batter- ies or light sources ➤...
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CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ Technical data CFF12 CFF18 CFF20 Ambient tempera- +16 °C to +43 °C (+60 °F to +110 °F) ture: Refrigerant: R134a Refrigerant volume: 26 g 20 g 28 g equivalent: 0.037 t 0.0286 t 0.040 t...
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Technical data CFF12, CFF18, CFF20, CFF35, CFF45, CFF70DZ CFF35 CFF45 CFF70DZ Dimensions (W x H x D) (includ- 715 x 407 x 398 mm 715 x 475 x 398 mm 914 x 500 x 443 m ing handles): (W x H x D) (without...
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Do you have a question about the CFF35 and is the answer not in the manual?
Questions and answers
My cooler is half empty and it will not build up no more colder than −2. And I gotta set of −18. Everything seems to be working.What's the problem
If your Dometic CFF35 cooler is not cooling below -2°C despite being set to -18°C, possible issues could include:
1. Insufficient ventilation – The cooler needs enough space for heat to dissipate. Ensure ventilation slots are not blocked and maintain at least 50 mm of clearance around them.
2. Incorrect orientation – If the cooler is not placed as specified, internal components can be affected, reducing cooling performance.
3. Power supply issues – If powered by a starter battery, ensure the battery monitor mode is set to "HIGH". If using a supply battery, set it to "LOW". Inadequate power can limit cooling.
4. Ambient temperature – Very high external temperatures can reduce cooling efficiency.
5. Overloading or frequent lid opening – Too much warm content or frequent opening can prevent the cooler from reaching the target temperature.
Check these factors to identify the cause.
This answer is automatically generated