Raypak 406A troubleshooting : Not firing

[Too_Tall]

Good morning folks,

I was trying to get my spa warmed up for an evening with family and my heater wouldn't fire.

I've recently backwashed. Normal pressure is 12psi on pool, jumps to 19psi when valves are switched to the spa. I've taken the top and front off the heater and cleaned out all the winter debris and all the wiring looks solid. I set the desired temperature on the easytouch and the heater light comes on but no fire. The screen on the heater itself says "no demand". No error codes are showing. I cut power to the system for a few minutes to reset the circuit board and didn't change anything. Is there anything else I can do before I have to call out a tech?

Thanks,

Tim

 

[ps0303]

Take the heater out of "remote" mode and try it.

Simultaneously hold down all three buttons to take it out of remote mode and then see if it fires. Make sure the temp is set to 104 for when you put it in remote mode.

 

[Too_Tall]

Take the heater out of "remote" mode and try it.

Simultaneously hold down all three buttons to take it out of remote mode and then see if it fires. Make sure the temp is set to 104 for when you put it in remote mode.

It fired up just fine after I got it out of remote mode. Temp was set to 102. Changed to 104. So that tells me something with the easytouch programming isn't telling the heater to fire?

Thanks for the response!

 

[ps0303]

I bet the two wire cable between the automation and the heater is bad.

 

[Too_Tall]

I bet the two wire cable between the automation and the heater is bad.

Inspected the wires from the automation into the heater circuit board. Other than some dust and debris I saw no shorts or visible evidence to suggest a bad wire. I'm no electrician so other than a multimeter test I don't know what much more I can do unless you have any other suggestions sir.

Thanks again.

Tim

 

[ps0303]

You could confirm continuity of the wire. Disconnect from heater and automation system. Twist the two wires on one end and then test the other end for continuity. If you have continuity, then yes the wire is good.

 

[gary300]

You could confirm continuity of the wire. Disconnect from heater and automation system. Twist the two wires on one end and then test the other end for continuity. If you have continuity, then yes the wire is good.

You could also just pull the two wires from the heater to the ET HEATER connector and twist them together. The relay on the ET board does the same thing (connects the two wires together). If the heater will then fire, it tells you that the wire connection to the heater is good, and something on the ET board is not right.