Hercules250 pool heater lights but not heating up the water hot

dear,

check this link and hope it will help you

globaltowne.com/manuals/125FX_English_12_yr.pdf

regards,

Check your thermo couple... Should be easy to access and replace.

check pressure switch for proper adjustment and make sure filter is clean so system pressure is normal

to test the presure sensor jump the wires that plug in to the sensor if it turns on the presure sensor is bad and the the thermostat do you mean thermo sensor the one that checks the water tep follow the wires to were they plug in turn power off get your finger wet and put it were it plugs in on the 2 prong and turn it on the heater will light up if the sensor is bad

A couple of things to check:

If possible, remove the pilot gas assembly and clean the gas jet and thermocouple - they can get carboned up and stop working properly. Make sure the pilot flame and deflector is aimed properly and making the thermocouple glow red hot. If the problem persists, you may want to replace the thermocouple and also check the propane regulator.

Do you have power to the heater?If you do then I would look for a hi limit switch to reset.It might be the pump you have to reset.

Try this web site!
http://www.protankless.com/BoschProHome/GasProducts/BoschGWH425HN/tabid/506/Default.aspx
Copy & Paste to Google search engine.

it sounds more like the ignitor thats messing up, if you are able to remove it and get a new one that would probobly do it for you

First Clean the ignitor assembly and make sure the flame is reaching the flame sensor strongly.

You may need to replace the flame sensor.