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Warning Code P1
Explanation: Water flow rate is less than minimum for main burner ignition. The unit must have
.66 gallons per minute before the main burner will light or sustain burner. When water flow does
not reach minimum flow rate for five seconds the warning code is displayed. This warning code
was introduced in September of 2007. At a minimum check the following:
1. Check cold water inlet screen for debris.
2. Check aerator screens of fixture for debris.
Disassembly and Repair – 1
(1) When performing maintenance and/or servicing the water heater, always turn off the
electric power, gas shutoff valve and water shutoff valve. Wait for the water heater to become
cool. Be careful to avoid injury to your fingers on sharp edges.
(2) Drain all water from the water heater when removing the water parts.
(3) Before any disassembly, make sure you have a good diagnosis. Remove only the parts
needed.
(4) Handle all parts carefully.
(5) When reassembling, prevent any foreign substance, i.e. dust, etc. from being introduced
into the water heater.
(6) After reassembling, check for gas and water leakage. Then, test ignition. Make sure
that there is no gas leakage in connections by testing with soap bubble solution. Bubbles
indicate a gas leak that must be corrected.
(7) Check the performance and operation after servicing.
To remove and replace any part on this tankless unit, you will need a magnetic tip, #2 Phillips
magnetic screwdriver that is at least 8 inches long. A flashlight and magnetic tip reach are
also handy. Rheem recommends the use of a parts tray or bowl to hold small parts and screws.
All of the hardware is essential to the proper operation of the unit upon re-assembly.
Process
1.
Printed Circuit Board (PCB)
a. Unscrew single screw at the
b. Pull PCB up and away.
c. Remove all Molex
st
Generation 7.4 product series
top of the PCB.
connections, Remote Control
connections and transformer
connections if replacing the
board. Otherwise, leave the
connections alone.
SVC 810 Tankless Troubleshooting Manual
Illustration
64
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