Electro Industries Mini-Boiler EMB-S-1, Installation & Operating Instructions Manual, Page: 11 / 20

03/12/2019
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BI309
TROUBLESHOOTING HELPS
Inside monitor – there are two red LED’s on the inside labeled “STG1” and “STG2”. Each LED is an
indication of stages of boiler on/off.
Located near the thermostat connection is a red LED labeled “MANUAL-HL-OK”. This LED represents the
205° F manual reset. If on, manual hi-limit is closed. If off, manual hi-limit is open.
Sequence – depending upon temperature difference between actual measured water temperature, desired
temperature (set point), and system flow, second stage may be delayed turning on for periods of four minutes or
greater.
Mechanical hi-limit, top vessel screw-in, automatic reset – this is at about 190° F, opens the red/white wire
loop. This can be monitored by the “Auto Reset” front indicator light. As the water cools to approximately
160° F it should self-reset and restart.
Manual reset limits – surfaced mounted to the top of the vessel, opens at 205° F. This opens all 24V control
power thus opening all element power relays. The observed action is the same as a blown fuse, no front panel
boiler power green LED.
To reset this device, simple press the red button.
Comment: The hi-limit auto reset red LED is only operational during an active heat call (lower red
LED on).
WARMFLO ® TEMPERATURE BYPASS TROUBLESHOOTING OR TESTING
Adding a jumper between “W” screw terminal and tab marked “E” bypasses the temperature sensing and
WarmFlo control. In other words, with the jumper installed, a “W” input represents both stages, full on.
Note: Basic 24V power must be present for the E-tab function to work.
Flow Switch Statement
A flow switch is not included with the boiler. However, one can be added to the LMC circuit. Simply place the
field provided flow switch in series with this circuit.
NOTE: The “L/W” (J3) jumper must be in the “W” position.
AVAILABLE, ELECTRO INDUSTRIES, INSTALL PARTS OR KITS
EMB-BK MINI-BOILER PLUMBING KIT BASIC
EMB-PK MINI-BOILER INSTALL KIT PREFERRED
EMB-P2 PUMP KIT 1/25HP BOILER
WFS2 TEMPERATURE WATER SENSOR
EMBS5636 REPLACEMENT CONTROL BOARD
5128C ELEMENT RELAY
5541 TRANSFORMER, 24V/40VA
5576 AIR ELIMINATOR 3/4" ROLLAIRTROL
5456A GAUGE PRES/TEMP 75 PSI/320DG F .25"
5453 VALVE RELIEF 30 PSIG .75” NPT MALE
5590 EXPANSION TANK 40K BTU 20.1 GALLON