Hayward HDF400 Universal Heater Issue

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Looks like the HC Series Universal model.
 
Last edited:
What code is it showing?

See...

www.manualslib.com

If

Hayward HC Series Manual Online: If'' Code. Inspect main gas supply Step 12A IF ''Ignition Failure'', Ensure main gas supply is in the ON position. IF ON, go to step 12B. IF NOT, open gas supply. Flame sensor & gas valve Step 12C Ensure both flame sensor and gas valve are both securely...
www.manualslib.com www.manualslib.com
 
hayward.com

Universal HC Series - Dual Fuel 400,000 BTU

The industry’s smallest footprint heater allows replacement of almost any heater in an existing pad with the efficient reliability of the new Universal HC Series dual-fuel technology heater from Hayward®.
hayward.com hayward.com

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Diagnostic Codes
Diagnostic
Code Description
AC Blower Vacuum Switch closed
A1 Air switch circuit open before ignitor warm-up
A2 Air switch circuit open after ignitor warm-up
A3 Air switch circuit open after post purge
b1 Ignition control board data error
b2 Gas valve sensed "ON" error
b3 Gas valve sensed "OFF" error
b4 Data retrieval error
bo Bypass operation mode
CE Communication Error Between Control Module and Display Interface Assembly
EE Bad board
HF Flame present with Gas Valve not energized.
HS Maximum return water temperature exceeded and / or rapid water temperature rise.
IF Ignition Failure
IO Ignitor Circuit Open
LO Water Pressure Switch, Vent Pressure Switch, or Temperature Limit Switch Fault
PF Voltage polarity reversed, low voltage detected
SB Keypad failure
SF Temperature Sensor (thermistor) input failure


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Attachments

  • 51300803801_RevD_b22e.pdf
    4.5 MB · Views: 0
When was this installed?

When did it begin to malfunction?

The display does not seem to be showing normal codes; maybe the display is missing segments?

Can you show the display on power up?
 

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In reviewing the manual I see that the blinking bars during startup have a meaning.

The snorting you hear is during the gas valve open indication.

You need to check the gas pressures using a manometer.

Has this heater ever run successfully or is this a new installation?

You may have air in the gas line that needs to be purged.

What is the size of your house gas meter? Post pics of your gas meter data plates.

Post pics of the heater and your pool equipment.

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Sounds like an airflow issue.

The blower sounds like it is cutting in and out, but that is hard to tell from the sound quality.

Clean the burner assembly.

Check the gas pressure at the inlet.

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Hayward hdf400 burner removal and cleaning.​


https://www.tiktok.com/video/7374468617330576682
 
Last edited:
Sorry for the late reply, unexpected out of town trip for work.

Full vid from start to finish.

I will answer each post and appreciate the help.

Just for background.

Had the old style HDF400 Hayward heater. Old heater had multiple manifold leaks, circuit board issues, display boards, etc. Heater was 10-12 years old. Finally wouldn’t light, so I was browsing for a used heater.

Found this one of Facebook and was in great condition. Seller came out to install (Pool Guy) and we have been troubleshooting the issues.
 
ajw22 said:
What code is it showing?

See...

www.manualslib.com

If

Hayward HC Series Manual Online: If'' Code. Inspect main gas supply Step 12A IF ''Ignition Failure'', Ensure main gas supply is in the ON position. IF ON, go to step 12B. IF NOT, open gas supply. Flame sensor & gas valve Step 12C Ensure both flame sensor and gas valve are both securely...
www.manualslib.com www.manualslib.com
Click to expand...
First code was A1 when testing after install. Installer went a bought a new air diff switch, no change. I did notice the A1 code goes away if testing with top cover on.
 
So this heater has never successfully fired at your pool?

Sounds like air needs to be purged from the gas line.
 
JamesW said:
hayward.com

Universal HC Series - Dual Fuel 400,000 BTU

The industry’s smallest footprint heater allows replacement of almost any heater in an existing pad with the efficient reliability of the new Universal HC Series dual-fuel technology heater from Hayward®.
hayward.com hayward.com

View attachment 613785




Diagnostic Codes
Diagnostic
Code Description
AC Blower Vacuum Switch closed
A1 Air switch circuit open before ignitor warm-up
A2 Air switch circuit open after ignitor warm-up
A3 Air switch circuit open after post purge
b1 Ignition control board data error
b2 Gas valve sensed "ON" error
b3 Gas valve sensed "OFF" error
b4 Data retrieval error
bo Bypass operation mode
CE Communication Error Between Control Module and Display Interface Assembly
EE Bad board
HF Flame present with Gas Valve not energized.
HS Maximum return water temperature exceeded and / or rapid water temperature rise.
IF Ignition Failure
IO Ignitor Circuit Open
LO Water Pressure Switch, Vent Pressure Switch, or Temperature Limit Switch Fault
PF Voltage polarity reversed, low voltage detected
SB Keypad failure
SF Temperature Sensor (thermistor) input failure


View attachment 613786
Click to expand...
Thanks, I am currently using that troubleshooting guide.

Seems to behave differently when in spa mode vs pool mode.

Now I get the PF code, no change in wiring, tested 120V input power. I will verify ground connections and even tried a new ICB with same results.
 
JamesW said:
Sounds like an airflow issue.

The blower sounds like it is cutting in and out, but that is hard to tell from the sound quality.

Clean the burner assembly.

Check the gas pressure at the inlet.

View attachment 613816
________________________________________________________________________________________________________________________________________

View attachment 613847
View attachment 613848
View attachment 613817

View attachment 613818​

Hayward hdf400 burner removal and cleaning.​


https://www.tiktok.com/video/7374468617330576682
Click to expand...
Inlet gas pressure was 9 and in specs with Hayward. Need to test output gas pressure and will also check and clean burner assembly. Slowly going through each component.
 

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