American Dryer Phase 6 Message: No HEAT
No HEAT means the burner did not light after the ignition retries. The dryer runs with no heat for 3 minutes or until below 100 F. Check the gas supply, the ignition module and the burner ignition parts.
High: the burner does not light and gas is involved, so the dryer is out of service until it is checked.
- Code
- No HEAT
- Maker
- American Dryer (ADC)
- Equipment
- Dryers
- Applies to
- American Dryer ML-175 and ML-190 with the Phase 6 OPL microprocessor controller (Phase 7 is a separate section of the same manual)
What does American Dryer (ADC) error code No HEAT mean?
When the controller calls for heat, the ignition system tries to light the burner. The standard retry count is 2, so there are up to 3 attempts, with a 1-minute purge between them to clear unburned gas. If the burner has not lit after the last attempt, the Phase 6 OPL controller shows No HEAT and runs the dryer with no heat for 3 minutes or until the temperature falls below 100 F. The manual's action is to check the gas supply, the ignition module and the burner ignition parts. The gas supply is first because a closed valve, an empty supply line or low gas pressure all look the same at the dryer. This differs from bURNER FLAME FAIL, where the burner lit and the flame then went out. Operators see the dryer tumble cold, sometimes after a clicking sound, and a damp load at the end.
Affected models and control systems
American Dryer ML-175 and ML-190 with the Phase 6 OPL microprocessor controller. Phase 7 is a separate section of the same manual and is not covered here.
Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.
What you may notice
- No HEAT on the display
- Dryer tumbles without heat
- Clicking from the ignition with no flame
- Load stays damp
Possible causes
Likely causes — what usually sits behind error code No HEAT on this control. A technician confirms which one it is before any part is replaced.
- Gas supply valve closed or gas pressure low
- Ignition module not sparking or glowing
- Burner ports blocked by lint or debris
- Air in the gas line after a long idle period
Safe checks before calling for service
- Check that the gas supply valve to the dryer is open.
- If you smell gas, leave the area, do not touch switches and call the gas utility.
- Clean the lint screen and check the exhaust.
- Restart once, and if No HEAT returns, call us.
How a technician diagnoses error code No HEAT
- Read the message and confirm No HEAT.
- Check gas supply and pressure.
- Check the ignition module and its output.
- Check the burner ignition parts.
- Check the retry sequence and purge.
- Gas supply, valve and ignition work is for a technician who works on gas appliances.
- A gas smell is a safety emergency that calls for the gas utility.
- Ignition tests involve line voltage.
How error code No HEAT differs from similar codes
No HEAT is a burner that never lit; bURNER FLAME FAIL is a flame that lit and went out.
Technical reference
- Document
- ML-175 / ML-190 Service Manual, Phase 6 / Phase 7 Microprocessor Controls (American Dryer Corporation)
- Maker documentation
- American Dryer (ADC) owner support
- Edition
- ADC Part No. 450431-3
- Models / control
- American Dryer ML-175 and ML-190 with the Phase 6 OPL microprocessor controller (Phase 7 is a separate section of the same manual)
- Section
- Phase 6 OPL System Diagnostics, Diagnostic (L.E.D. Display) Failure Codes, printed p.21
- Checked
- October 2026
We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.
Related American Dryer (ADC) dryer error codes
How many tries does the dryer make?
The standard retry count is 2, up to 3 attempts, with a 1-minute purge between.
What does the dryer do after No HEAT?
It runs with no heat for 3 minutes or until below 100 F.
What if I smell gas?
Leave the area and call the gas utility.
Need help with American Dryer (ADC) error code No HEAT?
A technician confirms the cause on site and gives you the price in writing before any work starts.