Raypak 266a Pool Heater (Natural Gas)

beerup608

Member
May 18, 2020
6
Volcom01
Hello all,


This is the first year trying to start my natural gas heater on my own. I have the water flowing through the heater properly, everything is clean, all wires are connected etc. Here is my problem, when I turn the power on it says the pool temp is 51 degrees, I raise the desired temp so the pool heater should kick in via electronic ignition but nothing happens. The heater doesn't even try to spark or attempt to do anything, the display says "no demand" and then just says "sensor open" and "off" above that. I looked for error codes and I couldn't find any. Gas is on a flowing to the heater. I heard it could be the Thermistor or the Tempature sensor...Is this the case?


Thanks in advance!
 

beerup608

Member
May 18, 2020
6
Volcom01

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
18,950
Northern NJ
Okay so after looking for a few hours. I cant find a Thermistor to buy. I found one but it was for a different model. Any help would be appreciated. Its a Raypak M266A Pool Heater, Natural Gas.
Page 48 of the manual lists this...


This may also help...


@swamprat69 @ps0303 @Pool Clown
 

beerup608

Member
May 18, 2020
6
Volcom01
Page 48 of the manual lists this...


This may also help...


@swamprat69 @ps0303 @Pool Clown
oh okay - I didn't know if a Thermistor and a Temperature sensor were the same thing. Thanks

So in theory, I install this and the heater should try and ignite and work properly? Anything else?
 

Pool Clown

In The Industry
Sep 5, 2008
2,136
Silicon Valley, CA
"Sensor open" is just that. The board is not getting a resistance reading. This can be due to the actual sensor itself has failed, or the wire that runs from the sensor to the board. Or, as these heater age, im starting to see the board (the sensor connection) beginning to fail too.
 

beerup608

Member
May 18, 2020
6
Volcom01
"Sensor open" is just that. The board is not getting a resistance reading. This can be due to the actual sensor itself has failed, or the wire that runs from the sensor to the board. Or, as these heater age, im starting to see the board (the sensor connection) beginning to fail too.
Thanks I bought the new sensor and wires. I will provide an update later this week.