Raypak 266,000 btu natural gas heater Error messages "sensor failed" and sensor shorted"

Jim GOZZ

New member
May 25, 2020
4
Chicago
Last year I believe gas built up inside the unit and when it finally lit, the door blew off.

that being said, it ran fine after that but later in the year I started getting the error messages "sensor failed" and sensor shorted" and the display tells me "No Demand and temp 213degrees.

what can you tell me?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,959
Northern NJ
Welcome to TFP.

You need to replace the temperature sensor thermistor. Page 46 in http://cdn.globalimageserver.com/FetchDocument.aspx?ID=c404f1c5-ac50-4209-9457-56246d010b20

Part 6C. P/N 009577F

 

Jim GOZZ

New member
May 25, 2020
4
Chicago
Welcome to TFP.

You need to replace the temperature sensor thermistor. Page 46 in http://cdn.globalimageserver.com/FetchDocument.aspx?ID=c404f1c5-ac50-4209-9457-56246d010b20

Part 6C. P/N 009577F

That's very helpful...I'm guessing that is on the right side of the unit and hopefully not too hard to change out. Thanks for all your help, I'll let you know if I'm able to get it going.
 

Jim GOZZ

New member
May 25, 2020
4
Chicago
ok, so i replaced the temp sensor (mice ate through wires)...I am still getting the following error messages:

"Sensor failure"
"Sensor Open"

and now a new error message...

"Low temp Lockout"

any ideas?