Thermo Dynamics CWL - User Manual

Questions and Answers

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Michael McgeeAug 21, 2025
Why does my Thermo Dynamics CWL Boiler burner fire, but then fail on safety?
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  Jesus MitchellAug 21, 2025
  If your Thermo Dynamics Boiler burner fires but then fails on safety, it could be due to a faulty or dirty cad cell (clean or replace it), a faulty primary control (replace it), a plugged heat exchanger (clean it out), line voltage below 120V (call the utility company), a faulty motor (replace it), or the pump or blower overloading the motor (replace the blower or pump).
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Stephanie SextonAug 31, 2025
Why is my Thermo Dynamics Boiler burner firing, but pulsating?
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  Antonio ReevesAug 31, 2025
  If your Thermo Dynamics Boiler burner is firing but pulsating, consider these causes: down drafts (install a vent cap), insufficient or excessive draft (increase or reduce the draft setting; install a second draft regulator if necessary), improper installation (move the draft regulator to the correct location or provide sufficient sources of air for combustion), improper adjustment (adjust the CO2 level, starting with the air band wide open, using an instrument), an air leak in the fuel system (repair the leak using only flare joints), or water in the oil tank (remove water exceeding 2" in depth).
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Gary WhiteSep 3, 2025
What to do if Thermo Dynamics CWL produces too much heat?
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  aprilmcculloughSep 3, 2025
  If your Thermo Dynamics Boiler produces too much heat, it could be due to several reasons. The circulator might not be stopping (repair the operating control). The thermostat could be set too high (reset it), defective (replace it), or out of calibration (recalibrate and check the level). Additionally, the flow valve might be dirty and stuck (clean it) or defective (replace it).
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Donald BrownSep 7, 2025
What causes high net stack temperatures in Thermo Dynamics CWL Boiler?
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  Kyle DavisSep 7, 2025
  High net stack temperatures in your Thermo Dynamics Boiler can be caused by a nozzle overfiring due to high pump pressure (reduce the pump pressure according to the installer/serviceman labels), a fouled heat exchanger (clean the heat exchanger), or baffles not installed (install the baffles).
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Andrew BlackwellSep 12, 2025
How to fix insufficient domestic hot water from Thermo Dynamics Boiler?
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  nicholasestradaSep 12, 2025
  Insufficient domestic hot water from your Thermo Dynamics Boiler may be due to insufficient coil capacity (install a larger coil), a setting that is too low (set the operating control to 180°F and raise the differential set point), a flow restriction (remove the restriction), or fouled surfaces on the heat exchanger (clean the heat exchanger surfaces).
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Micheal BoothNov 13, 2025
Why won't my Thermo Dynamics CWL Boiler burner start?
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  dmccoyNov 14, 2025
  Several factors can prevent your Thermo Dynamics Boiler burner from starting. The thermostat might be set too low, or set to “off” or “cool”—turn it up or switch it to heat. There may be open or loose thermostat wires—repair or tighten them. The thermostat itself could be faulty or not level—replace or level it. Other potential causes include a tripped burner motor (push the reset button), a tripped primary safety switch (reset it), an open switch (close it), a tripped breaker or blown fuse (reset or replace it), open cad cell wires (repair or replace them), a dirty or faulty cad cell (clean or replace it), an open limit control switch (check the limit setting), an open circuit between the limit control and disconnect switch (repair the circuit), low line voltage or power failure (call the...
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Shawn Rowland IINov 17, 2025
What to do if Thermo Dynamics Boiler burner starts but does not establish flame?
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  David AvilaNov 17, 2025
  If your Thermo Dynamics Boiler burner starts but doesn't establish a flame, consider these possible causes: the oil tank may be empty (fill it), there might be water in the oil tank (remove water exceeding 2" in depth), or the fuel supply valve could be closed (open the valve). Other potential issues include an air leak in the fuel system (repair the leak using flared fittings and avoid Teflon tape), a plugged oil filter (replace the filter cartridge), a plugged pump strainer (clean the strainer), a restriction in the oil line (repair the oil line), a worn pump (replace the pump), a worn or broken coupling (replace the coupling), a pump discharge pressure set too low (set the pressure according to the installer/serviceman labels), line voltage below 120V (replace the transformer), carboned...
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tracyariasNov 23, 2025
What causes a Thermo Dynamics Boiler burner to fire, but then lose flame?
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  Kelly AndersonNov 23, 2025
  If your Thermo Dynamics Boiler burner fires but then loses its flame, several factors could be responsible: * Unbalanced fire (replace the nozzle with the specified nozzle). * Excessive or insufficient draft (reduce or increase the draft setting). * Insufficient combustion air sources (increase combustion air sources). * Air leak in the fuel system (repair the leak using only flare fittings). * Water in the oil tank (remove water exceeding 2" in depth). * Fuel supply valve closed (open the valve). * Restriction in the oil line (clear the oil line restriction). * Plugged fuel filter (replace the filter cartridge). * Plugged pump strainer (clean the strainer). * Cold oil (use #1 heating oil). * Too much combustion air (close the air band and air to raise CO2; check wit...
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Terri HoffmanNov 27, 2025
How to troubleshoot insufficient heat from Thermo Dynamics CWL Boiler?
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  Brian JohnsonNov 27, 2025
  To troubleshoot insufficient heat from your Thermo Dynamics Boiler, check the following: a worn or broken coupling (replace it), a binding pump (replace it), a burned-out circulator motor (replace it), defective wiring from the operating control (repair the wiring), a defective operating control (repair or replace it), an undersized circulator (replace it with a proper one), a defective circulator (repair it), insufficient voltage (call the utility company), settings that are too low (increase the settings), a bad thermostat location (move the thermostat to a better location), a thermostat out of calibration (recalibrate and level it), a flow valve not opening fully (clean or replace it), airbound radiators (bleed the radiators), inadequate radiators (install adequate radiation), an unders...

Summary

Service Policy

Read This First

Model Specifications

Installation Guide

Boiler Location and Clearances

Operation and Servicing

Boiler Start Up Procedure

Step-by-step guide to safely start the boiler.

Initial Start Up Adjustments

Burner Adjustment Procedures

How to adjust the burner for optimal performance.

Maintenance Procedures

Oil Burner Component Servicing

Troubleshooting Guide

Burner Failure to Start

Diagnosing why the burner won't ignite.

Burner Ignition Failure (No Flame)

Troubleshooting steps for ignition problems.

Burner Safety Shutdown Issues

Resolving problems causing burner safety cutoffs.

Overheating Conditions

Addressing issues related to excessive boiler temperature.

Flame Loss During Operation

Troubleshooting intermittent flame loss.

Pulsating Burner Operation

Solutions for a burner that fires erratically.

Insufficient Heating Performance

Diagnosing and fixing low heat output.

High Stack Temperature Issues

Insufficient Hot Water Supply

Resolving problems with domestic hot water output.

Service Set-Up Tips

Preliminary Settings

Electrical Diagrams

Thermo Dynamics CWL Specifications

General

Boiler Type	Condensing
Efficiency	Up to 95% AFUE
Heat Exchanger Material	Stainless Steel
Fuel Type	Natural Gas, Propane
Ignition System	Electronic
Operating Pressure	30 psi (Maximum)