BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
11
Troubleshooting Guide Section 7
7.1 TROUBLESHOOTING – For Use of Licensed Electricians Only
WARNING
RISK OF ELECTROCUTION – HIGH VOLTAGE - ALWAYS SHUT OFF MAIN POWER TO THE
ELEMENT HEATING CIRCUIT BEFORE TROUBLESHOOTING! Also, be careful of 120V power
while troubleshooting near Line-in terminals (L1&L2), Pump terminals (P1&P2) and other areas
of the controller.
This section is meant to assist the service technician when troubleshooting the electric boiler. As in any
troubleshooting procedure, it is important to isolate a problem as much as possible before proceeding.
Often the controller error message LEDs can be a great help in identifying the cause of a problem. If you
suspect a wiring fault, carefully check all external wiring and wiring connections following the wiring
diagram sticker on the back of the boiler's door. An additional wiring diagram is enclosed with this
manual.
PROBLEM CAUSE SOLUTION / CHECK
• Incorrect supply power. • Check for 115V (AC) across L1 and
L2.
• Controller fuse blown. • Check fuse and replace if necessary.
Power LED (green) is not lit.
• Internal control fault. • Replace controller.
• High-limit wire is disconnected or
misconnected
• Red wire of sensor must be connected
to HL.
• Operating sensor fault (allows water
temperature to reach the high-limit)
• Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
• High-limit sensor fault • Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
High-Limit LED (red) on controller is lit.
• Internal control fault • Perform "Sensor Check" described in
7.2 and replace control board if
necessary.
• Operating sensor wire is disconnected
or misconnected.
• White wire of sensor must be
connected to OL.
• Operating sensor fault. • Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
Sensor LED (red) on controller is lit.
• Internal control fault. • Perform "Sensor Check" described in
7.2 and replace control board if
necessary.
• Neutral wire of sensors is
disconnected or misconnected.
• Black wire of sensors must be
connected to CL.
• High-limit or operator sensor fault. • Perform "Sensor Check" described in
7.2 and replace sensor if necessary.
Both High-Limit and Sensor LEDs (red)
on controller are lit.
• Internal control fault. • Perform "Sensor Check" described in
7.2 and replace control board if
necessary.
• Thermostat fault. • Disconnect thermostat from controller,
turn thermostat to maximum setting,
and check continuity.
No heat when called by thermostat and
stage LEDs are NOT
lit.
• Internal control fault. • With thermostat disconnected from
board, voltmeter should read 24V (DC)
across terminals T1 and T2.
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