I have a Ramco spa pack and the heater works at first but once it reaches temp and turns off. When the heater tries to kick back on the contactor will chatter and not close all the way unless i push it in. What can cause this i think the model # is 9005-211B-27H21 do you have a wiring diagram for this i may have a wire crossed somewhere.it is wired for 120V

Electric heating eliment is shorted together or to ground. .

bad temp sensor

Dean,

Thank you for asking me to help you with your problem. However, this is either not within my level of expertise or the question is unclear or there is not enough information and I cannot help you at ths time.

Allheaters run off of a thermostat just like the heat to your house. It will shut off once heated to the selected temperature. Turn up the temperature, and monitor it for a couple days.

The Cspaxi series also have a pressure sensor which senses the pressure inside the heating tank. This sensor connects to the coil on the contactor, insufficiant pressure in the tank will cause a delay in the contactor activating. It sounds like your problem can be caused by insufficiant water flow from the pump, a clogged or pinched water line to the heater, or a faulty pressure sensor.

the thermostat sends a signal to the circuit board. Not knowing anymore than I do about your heater or furnace I would suggest that that is a good place to start. Any limit or safety switch wouldnt coincidentally shut off the heater when it reached the set temp.

Hard to saw from here, but I assume you have a book on this, find your hi limit switch, it will have a reset button on it. It will be behind a rubber plug on the housing but is hard to reset sometimes. If you pull the cover it is easy to reset and once you see it you will be able to do this with the cover on.
If not this some damage may have been done to the coil in the contactor, you should be able to see it pull in or at least hear it klunk when the heater kicks on.You probally won't be able to feel heat when it runs as it is designed to protect you from scalding when it runs but you should feel a slight difference in the temp of the water coming from the returns in the spa. good luck and let me know how it works out.

Look at the sensor that tells unit that everything is lit. There should be some sort of sensor that tells the ECU that the ingnition area is a burn temp. It sounds like the unit can't tell that flame is lit. Hope this helps.

Anytime the heater is reading the water temp to be above what it actually is, especially 126, the problem is the Thermistor, or Temp Sensor, for the heater. This is a very easy part to replace. The Thermistor is located on the manifold, on the left side, between the top two bolts.

Sorry this is a late response! Hope that it helps!

temp sensor get the new one with yellow wires.should do the trick.