HydroStat 3200 Installation Instructions And Operating Manual page 7

Troubleshooting Flow Chart 2 – Burner Will Not Shut Down
Is the
YES
Red LED
(LOW WATER)
On?
NO
Is either
YES
Yellow LED
On?
NO
Is the
YES
Thermostat
(T-T) Calling
for Heat?
NO
Is the
YES
Domestic Water
(I1-I2) Calling for
Heat?
NO
Is the
NO
Low Limit Dial
Set to OFF?
YES
Is there
NO
24 VAC between
B1 and B2?
YES
Replace
Control.
The Control is
Sensing
Low Water.
The Control has
Reached Target
or High Limit
Temperature.
The Control is
Operating
Normally.
The Control is
Operating
Normally.
Check temperature display. When the Low Limit is
set, the HydroStat will fire the burner until the
temperature reaches the Low Limit Setting.
Recheck
Wiring.
If there is no call for heat (from T-T, I1-I2 or Low
Limit), there should be 0 VAC between B1-B2.
If there is voltage between B1-B2, the control
should be replaced.
7
WARNING!
TURN OFF POWER TO BURNER IMMEDIATELY!
CAUTION – ALWAYS ALLOW A BOILER TO FULLY COOL
BEFORE ADDING WATER.
Recheck wiring. Make sure that burner is wired to
B1. Burner should never fire when red or yellow
LED is lit.
The burner will continue to fire when there is a call
from the thermostat or external zone.
When there is no call to fire the burner, the voltage
should be 0 volts between B1 and B2.
Make sure the burner is wired to B1.