Electric Booster– Installation, Operating and Maintenance Instructions
11
Problem Possible Cause Solution
Temperature & pressure relief
valve discharges water
Thermostat set too high
above 185ºF (85ºC)
Remove front cover. Adjust thermostat
to a lower setting.
Pressure increases to 125
p.s.i. during booster heater
heating cycle because:
A. Pressure reducing
valve is an incorrect
style (without relief by-
pass). Letter “B”
should be in model
number.
Replace with correct pressure reducing
valve.
B. By-pass in pressure
reducing valve plugged
or inoperative.
While unit in heating cycle, tap pressure-
reducing valve with wood hammer or
screwdriver handle. If pressure gauge
does not show drop in pressure, replace
pressure-reducing valve.
Temperature & pressure relief
valve discharges water (after
checking above).
Relief valve not reseating
properly.
Quickly lift and release manual
discharge lever on relief valve to assist
proper reseating. If this fails, replace
temperature and pressure relief valve.
Water leaking from booster
heater.
Element and thermostat
threads may be leaking.
Turn off electricity to booster heater and
tighten elements.
Turn off water, drain, remove and apply
sealant if necessary. (Be sure to turn off
electricity before draining or elements
will burn out).
Plumbing connections may
be leaking.
Tighten incoming pipes, heating
elements, and temperature & pressure
relief valve. Turn off water, drain and
remove and apply sealant if necessary.
(Be sure to turn off electricity before
draining or elements will burn out).
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