Service Manual

46
Step 1. When Error Code 29 is present you first must
determine if the circulator or flow switch is bad.
Step 2. Check if there is 120V to
the circulator harness (see
picture below). If voltage is not present trace wire
harness for any sign of damage. Replace harness if
damaged. If voltage
is present replace circulator see
step 5.
Step 3. Check if the flow switch is working properly (see
picture below). Using a volt me
ter check the
continuity between top and bottom screw terminals on
the flow switch. If the circulator is flowing water there
will be conti
nuity.
Step 4. If there in no continuity present gently push down the
flow switch lever down to make continuity. If
continuity is made rechec
k to see if the circulator is
bad. If continuity is not made replace the flow switch
see step 5.
Step 5. Position main power switch to “O
FF”
Step 6. Disconnect (unplug) water heater from 120
volt power source.
Step 7. Turn off water supply and drain water heater.
Step 8. Once the
water heater is drained remove the cable
ties holding on the pipe insulation. Save the pipe
insulation to replace after repair is made
.
Step 9. Disconnect and replace either the flow switch and/or
circulator assembly.
Step 10. During replacement of the components, apply thre
ad
sealing tape or other thread compound to threads of
the flow switch or circulator assembly onto heater.
Restore water supply and check for and
repair any
leaks found.
Step 11. Replace pipe insulation from step 8.
.
Step 12. Restore 120 volt power supply to water
heater and confir
m proper operation following
the lighting instructions on the lighting
instruction label or the lighting instruction
located in the installat
ion and operating
instruction manual.
Circulator (120V)
Flow Switch
Check voltage of
bottom to
connections with
volt meter
Remove cover from
flow switch
Gently pull the lever up to
break continuity or push the
lever down to make continuity
Check continuity
between top and
bottom screws
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