Raypak RP2100 Service Light

My 10 year old Raypak RP2100 service light went on and will not heat up. I opened up the panel to view the circuilt board and see a red led lit.

The board shows:

OVERTEMP {LED} SENSOR {LED} FAIL

The led between SENSOR and FAIL is lit. I'll take this at face value and consider some kind of sensor has failed but which one and how to confirm which one. Is there a way to short the sensor leads or do some 'trick' to let the circuit board know all is ok to lit?

This happens as soon as the unit is turned on so it is not possible for an over temp situation. This happened last week and I could swear that both LED's were lit but today only the 1 LED is lit.

I did several Google searchs and did not find anything. We must have an 'old' version since most postings had to deal with a display panel that will show error codes but my panel has no such display, only the rocker switch and lights.

The sensor (mounted on the inlet / outlet header), is done. You will need to replace it. Thats the way it has been, for me.

Now, i suppose that the plug (on th circuit board), could go bad, I just haven't ever seen it. I have changed maybe 10, over the years. A very reliable sensor IMO.

Note: There may be a chart in your owners manual that will list various resistances to temperature, if you wanted to test the sensor with an ohm meter.

Did that make any sense?

Which sensor? There is a sensor on the INLET with 3 wires (2 red, 1 black) and there is another sensor on the side of the OUTLET. There are only 2 wires on the outlet sensor with spade connectors.

By the way, I just checked this and now the other LED light is on (between OVERTEMP and SENSOR). Before, only the LED between SENSOR and FAIL was lit. Do you know what each ones of these mean?

Thanks

My replacement temperature sensor showed up today and I installed it. I still get the same error lights. Any help?

What i have been told (from Raypak) is that when that light has come on, its that the board has experienced and over temp condition, not water temp, but probably a voltage problem within the board. Unfortunately the board is done, and will need to be replaced.