Cleaned vent , code 13 comes up when i open 2 faucets , does not do it with one open
Ditto, or a dirty burner tray.
What happens is the gas pressure isn't strong enough to operate with dirt / dust in the machine.
Pit should be serviced anyways.
Two things- Clean the sensor rods or replace(cheap and easy with YouTube instruction video) and at the same time replace the mail program chip( also a easy plug in chip). The whole repair takes two hours for a homeowner and costs about 50 bucks for a chip.
I have the exact same problem with error code 13 on my Rheem/Ecosense 180dvn . The unit ran good for at least a year, and then I started getting the same error 13 every few minutes. I called the Rheem service department, and they told me to check the vent installation as well as the gas pressure. I reinstalled the vent with new seals. I only have about 6 ft of vent, so there should be very little resistance. I checked the gas pressure, and it shows 9 in H20 pressure, which is well in the range recommended. The service center scoffed at the suggestion that it could be their circuit board. I am totally at a losss and at the verge of ripping this very expensive installation out of my attic.
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