Rinnai Q series Troubleshooting Manual page 7

The 120 volt external pump is for
E and QP model boilers
If multiple boiler safeties are to be wired in series check with your local inspector or the local or State
codes to see if this is allowed in your area before proceeding. NEVER wire boiler safeties in parallel.
Refer to wiring diagram in the boiler manual. Trace connections 24 and 25 above back to the MCBA.
These will be located on Plug X5 on the MCBA on pins 2 and 6.
Rectify error by determining which external
contact is open. If external contacts are not being
used place jumper across terminals 24 & 25
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