Raypak Model 407A New P.C. Control Board Display Reads Flame w/o CFH

WCC

In The Industry
Jun 7, 2020
1
Thousand Oaks
Installed new P.C. Control Board on a 2015 Raypak Model 407A to replace the existing and failing P.C. Control Board. After installation was completed the display shows the following status and diagnostic message: Flame w/o CFH. Exterior gas service line valve and internal gas valve are both in the on position.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
19,405
Northern NJ
The error means that the board is receiving a microamp signal from the flame sensor without a Call For Heat. Read...


I would carefully check the connections you made to the new control board. Especially the grounds.
 
Last edited:

JamesW

TFP Expert
Mar 2, 2011
20,360
Service Menu and Fault History
To access the Service Menu and fault history, press the MODE and UP buttons simultaneously for 3 to 5 seconds. The heater will continue to operate normally while in the Service Menu. The first screen displayed is the Flame Strength indicator, which indicates the pilot flame current using a bar graph and numerical display. A signal of less than 4 indicates a weak flame signal and may require service. Refer to Section 5 Troubleshooting for possible causes and corrections.

Press the DOWN button. The Supply Voltage screen indicates the voltage supplied to the control board.
Normal readings range from 24 to 29 volts.

Press the DOWN button. The Run Time indicates the total hours of operation for the pool heater, as measured by the amount of time that the main gas valve has been powered. The Cycle count indicates the number of on/off cycles of the heater, as measured by the number of times the pilot valve has been powered.

Press the DOWN button. The Fault History can display up to ten faults in memory. The order of the faults begins with “Fault Last,” which is the most recent fault, and proceeds through ten most recent messages in chronological order. The second line of the display shows the fault message. If there are no faults in the history buffer, the second line reads “All Faults Clear.”
 

JamesW

TFP Expert
Mar 2, 2011
20,360
The flame strength should be zero when the heater is off.

If it's more than zero, there's a problem.

There are test points on the circuit board that you can test the dc microamps if you have a good true RMS multimeter.