The homeowner is gone all week and home on weekends only . Error code #13 keeps shutting the unit down . The unit runs fine all week , and starts throwing the code when home owner arrives home . Its a small 1200ft house with 2 zones . Mixing valve on domestic side is currently on 4 which is hot .
The code 13 in the manual says on page 35 Heating flow SWITCH failure , then on page 36 says under the same code "heating flow SENSOR failure . Now these are seperate components , and seem to be confused for one another in some trouble shooting information ive tried to dig up .
Since the unit throws the code when homeowner arrives I have to believe that it has somthing to do with the domestic water side since thats the only variable that changes through-out the week . Although it has thrown the code on the weekend after the unit has been reset manuly without the use of the domestic side .
The SENSOR ohms out correctly . Unit installed in june and problem started over last few weeks .
Im going there tomarrow morning , but I'm running out of ideas .
Upstae ny , average temp near freezing