COZY DVCF403C-H User Manual (English)

Questions and Answers:

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Peter MillerSep 7, 2025
Why do my COZY DVCF403C-H pilot and main burner go out during normal operation?
- D
  Dustin JonesSep 7, 2025
  This issue can occur due to several reasons. A weak thermocouple might be the cause; check the millivoltage and replace the thermocouple if it is low. The input might be too high, so check the input rate. Ensure the cover around the pilot lighter hole is airtight by tightening the wing nuts securing the cover and sight glass, and replace the gasket if needed. Also, improperly installed or sealed vent tubes can cause this; follow the instructions to check both exhaust and air intake tubes and the vent cap, ensuring all gaskets are in place and properly sealed, and use only the tubes and vent cap supplied, without altering them.
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Hector DaughertyAug 23, 2025
Why won't my COZY DVCF403C-H burner turn off?
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  Ms. Alexis ThomasAug 25, 2025
  The burner might not turn off due to several reasons. It could be a defective or damaged thermostat wire or the thermostat itself; this can be checked by removing the wire from the valve terminal. If the valve goes off, replace the wire or thermostat. The thermostat location might be incorrect, so follow the installation instructions and check the location. A defective or sticking valve can also cause this issue, requiring valve replacement. Finally, excessive gas pressure could be the cause; contact the utility supplying gas in this case.
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Gregory PierceAug 25, 2025
Why my COZY Wall Furnaces burner won’t turn on?
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  fleeAug 26, 2025
  Several issues could prevent the burner from turning on. First, ensure the gas valve is in the “on” position. Check for 24 Volts to the valve from the transformer. Verify the wall thermostat is functioning correctly. Ensure there is 115 V line voltage. The gas valve itself may be defective and need replacement. Lastly, check if the manual reset switch is engaged by depressing the red button on the switch.
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Stephen SimpsonAug 26, 2025
Why COZY DVCF403C-H standing pilot won’t light or stay lit?
- N
  nelsonmarkAug 27, 2025
  If the pilot won't light or stay lit, there might be air in the line, so bleed the line. The thermocouple could be defective, so replace it. The pilot flame might be too low, so adjust it. Also, the manual reset switch might not be engaged, so depress the red button on the switch.
J
Jeffrey RiosAug 27, 2025
What to do if COZY DVCF403C-H I.I.D. pilot won’t light?
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  Phillip Branch MDAug 27, 2025
  If the I.I.D. pilot won’t light, check the wire connections for the sparker and provide an adequate ground. If the sparker won’t light the pilot, the pilot flame might be too small, ensure the valve is in the “on” position, and check for any pilot restrictions. Also, verify that the manual reset switch is engaged by depressing the red button on the switch.
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Terry StoutAug 28, 2025
Why won't the burner turn on in my COZY Wall Furnaces?
- A
  Angel KruegerAug 29, 2025
  If the burner of your COZY Wall Furnaces won’t turn on, here are several things you can check: 1. Ensure the gas valve is in the “on” position. 2. Verify there is 24V power to the valve from the transformer. 3. Check the wall thermostat. 4. Confirm that 115V line voltage is supplied. 5. If none of these work, the gas valve may be defective and need replacement. 6. Also, make sure the manual reset switch is engaged by depressing the red button on the switch.
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Lindsey WalshSep 13, 2025
Why is my COZY DVCF403C-H not producing enough heat?
- A
  Angela MarshallSep 13, 2025
  If your COZY Wall Furnaces are not producing enough heat, consider the following: 1. The furnace might be undersized. Have a heat loss calculation performed and compare it to the furnace output. Your gas company can provide this information. If it is undersized, replace it with a unit of the correct size. 2. Ensure the thermostat is set to a sufficiently high temperature. 3. Check the supply pressure to make sure it is correct.
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Lisa LynnSep 15, 2025
Why is my COZY DVCF403C-H producing too much heat?
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  Marc HernandezSep 15, 2025
  If your COZY Wall Furnaces are producing too much heat, consider these solutions: 1. Lower the thermostat setting. 2. The combination control valve might be stuck open, requiring replacement.
B
Brenda JohnsonSep 5, 2025
Why COZY DVCF403C-H Wall Furnaces has a delayed ignition?
- R
  Robin RamirezSep 5, 2025
  A delayed ignition could be due to a few reasons. The pilot flame might be too small, so adjust it. The burner ports might be clogged at the pilot; clean them, being careful not to enlarge them. Low gas pressure could also be the cause, so check the gas supply pressure. Finally, if the pilot decreases in size when the main burners come on, the supply piping is likely too small. Consult your local gas company or a competent installer.
D
Dylan HowardSep 3, 2025
What to do if my COZY DVCF403C-H fail to ignite?
- C
  Cathy ReevesSep 3, 2025
  If your COZY Wall Furnaces fail to ignite, here are some potential solutions: 1. Ensure all manual gas valves are open. 2. Set the thermostat to a higher temperature. 3. Clean any clogged burner orifices, being careful not to enlarge them. 4. Check the thermostat wiring. You can jump across the thermostat terminals at the valve; if the valve opens, re-check the wiring or replace the thermostat.

COZY DVCF403C-H Specifications

General

Model	DVCF403C-H
Category	Wall Furnaces
Brand	COZY
Type	Direct Vent
Fuel Type	Natural Gas
BTU Input	40, 000
BTU Output	32, 000
Efficiency	80%
Venting	Direct Vent
Ignition	Electronic