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from vessel wiring box.
b. If voltage is present and the wiring check was OK, refer to recommended
troubleshooting steps in behavior tree 01 (Section 9.1).
c. If voltage is not present, perform the following circuit checks.
i. Check for voltage across B1 and B2 on the control aquastat.
1. 115 volts: Shut off power to the unit. Fix the wiring connections in
the vessel wiring box terminal strip.
2. No voltage: Go to next step.
ii. Check for voltage across L1 and L2 on control aquastat.
1. 115 volts: Replace control aquastat.
2. No voltage: Go to next step.
iii. Check for voltage at High Temperature Limit Aquastat Control.
1. 115 volts across high limit control terminals: Press reset button and
recheck. If still 115 volts, replace high limit control.
2. No voltage: Go to next step.
iv. Check for voltage at Low Water Cut-Off Control (press reset button first).
1. 115 volts across terminals 2 and 5: Shut off power to unit and fix
wiring connections to the high limit aquastat.
2. No voltage: Go to next step.
v. Check water level in the vessel. Remove temperature gauge to check the
water level.
1. Water is below probe of Low Water Cut-Off: Raise water level, and
check / repair system for leaks.
2. Water is above probe: Go to next step.
vi. Check for voltage across Low Water Cut-Off terminals 1 and 2.
1. 115 volts: Go to maintenance section 8.5.2. If probe or control is
found to be bad, replace.
2. No voltage: Make sure that the switch on the side of the Low Water
Cut-Off is turned on. If not, turn it on. If still no voltage, go to next
step.
vii. Check for voltage at the junction box.
1. 115 volts: Fix connections to the low water cut-off control.
2. No voltage: Contact an electrician to repair supply power to
junction box.
