COZY DVCF553C-H User Manual (English)

Questions and Answers:

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Brandon HickmanSep 7, 2025
Why do my COZY DVCF553C-H pilot and main burner go out during normal operation?
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  Daniel BeanSep 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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Michael BrownAug 23, 2025
Why won't my COZY DVCF553C-H Wall Furnaces burner turn off?
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  Charles MillerAug 23, 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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david66Aug 25, 2025
Why my COZY DVCF553C-H burner won’t turn on?
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  Bruce LopezAug 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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Harold HernandezAug 27, 2025
Why COZY DVCF553C-H Wall Furnaces standing pilot won’t light or stay lit?
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  Matthew RoseAug 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.
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Wanda RobertsonAug 27, 2025
What to do if COZY DVCF553C-H Wall Furnaces I.I.D. pilot won’t light?
- J
  johnholmesAug 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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Samantha GutierrezAug 28, 2025
Why won't the burner turn on in my COZY DVCF553C-H?
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  xwilliamsAug 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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amandaharrisSep 13, 2025
Why is my COZY Wall Furnaces not producing enough heat?
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  keith27Sep 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.
A
aaron95Sep 14, 2025
Why is my COZY DVCF553C-H producing too much heat?
- D
  Deborah DiazSep 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.
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tammyvelasquezSep 5, 2025
Why COZY DVCF553C-H Wall Furnaces has a delayed ignition?
- T
  Tom ZimmermanSep 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.
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emilycunninghamSep 3, 2025
What to do if my COZY DVCF553C-H Wall Furnaces fail to ignite?
- G
  Gina MillerSep 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 DVCF553C-H Specifications

General

Category	Wall Furnaces
Brand	COZY
Model	DVCF553C-H
Type	Direct Vent
Fuel Type	Natural Gas
Venting	Direct Vent
Ignition	Electronic Ignition
BTU Input	55, 000 BTU
Thermostat	Built-In

Summary

Read Carefully Before Installing Unit

Specifications and Dimensions

Introduction

Overview of the direct vent counterflow wall furnace and installation instructions.

Safety

Essential safety precautions and guidelines for operating and installing the furnace.

Venting

Carbon Monoxide Poisoning Hazard Warning

Crucial warning about the risk of carbon monoxide poisoning due to improper venting.

Clearances

Locations

Installation

Electrical Rough-In

Instructions for preparing the electrical connections for the furnace installation.

Rough-In Gas Supply

Guidance on installing the gas supply line and ensuring proper connections.

Locate Vent Opening

Procedure for determining and cutting the opening for the vent pipe.

Installing the Furnace

Steps for physically mounting and connecting the furnace unit.

Gas Connection

Detailed steps for making the gas line connection to the furnace control valve.

Thermostat Installation

Instructions for mounting and wiring the thermostat for furnace control.

Operation

Lighting Instructions

Safety Before Lighting

Essential safety warnings and procedures to follow before attempting to light the pilot.

Pilot Lighting Procedure

Step-by-step guide for safely lighting the pilot light using the piezo ignitor.

Turning Off Gas to Appliance

Steps to safely shut off the gas supply to the furnace.

Maintenance

Pilot Adjustment

Procedure for adjusting the pilot flame to the correct size and position.

Manual Reset Switch

Explanation of the manual reset limit switch and its function.

Main Burner Inspection and Cleaning

Steps for removing, inspecting, and cleaning the main burner assembly.

Proper Burner Flame

Description of the correct burner flame appearance and troubleshooting tips.

Terminal Block Wiring Diagrams

Diagrams showing the wiring connections at the terminal blocks for different models.

Wiring Schematics

14-PEK Plug Extension Kit Installation

31300-A Cabinet Trim Kit Installation

306SR & 30SRB Side Discharge Kits

Rough-Ins for Side Discharge Kits

Instructions for preparing openings for side discharge kit installations.

Troubleshooting - Main Burner

Flame Too Large

Troubleshooting steps for a burner flame that is too large.

Yellow Burner Flame

Diagnosing and correcting a yellow or improper burner flame.

Gas Odor

Actions to take if a gas odor is detected around the appliance.

Delayed Ignition

Troubleshooting causes for delayed ignition of the burner.

Failure to Ignite

Steps to resolve issues when the burner fails to ignite.

Burner Won't Turn Off

Diagnosing why the burner continues to operate when it should be off.

Incorrect Gas Input

Checking and correcting incorrect gas input to the burner.

Not Enough Heat

Troubleshooting insufficient heat output from the furnace.

Too Much Heat

Diagnosing and resolving issues causing excessive heat.

Pilot and Main Burner go Out During Normal Operation

Resolving instances where the pilot or main burner shuts off unexpectedly.

Burner Won't Turn On

Troubleshooting steps for when the burner fails to start or ignite.

Pilot Won't Light or Stay Lit

Diagnosing and fixing issues with the pilot light not igniting or staying lit.

Pilot Won't Light (IID Pilot)

Specific troubleshooting for intermittent ignition (IID) pilot light failures.

Troubleshooting (Intermittent Ignition System)

No Call for Heat (OFF)

Indicates no demand for heat; system is in standby mode.

Startup - Flame Sense Calibration (Flash Fast)

System is calibrating flame sense during startup sequence.

Normal Operation (Heartbeat)

Indicates the furnace is operating normally.

5 Min. Retry Delay (Code 2)

Pilot failed to detect, initiating a retry delay for ignition.

Recycle Flame Failed (Code 3)

Flame failed during run; system will attempt to re-initiate ignition.

Flame Sensed Out of Sequence (Code 4)

Flame detected when not expected; system attempts self-correction.

Flame Sense Leakage to Ground (Code 7)

Issue with flame sense lead wire, potentially a short to ground.

Low Secondary Voltage Supply (Code 8)

Low voltage detected, affecting control module operation.

5 Minute Retry Delay (Code 6+2)

Retry delay for ignition after multiple failures on same call for heat.

Flame Failure (Code 6+3)

Flame failure detected on sixth attempt during call for heat.

Flame Sensed Out of Sequence - Longer (Code 6+4)

Flame sensed out of sequence for over 10 seconds, leading to soft lockout.

Soft Lockout (ON)

System in soft lockout due to self-check error; resets after one hour.

Parts List

Burner Assembly

Illustration and reference to parts specific to the burner assembly.

40542-A Rear Register Kit

Information and parts for the rear register kit used on single wall models.

Thermostat

Illustration of the thermostat and its associated part number.

I.I.D. Control Module

Illustration of the Intermittent Ignition Device (IID) control module.

Limited Warranty

Warranty Period Details

Specifies the warranty duration for tubes/heat exchanger and burners.

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