Frontier Oil Heat – PN 10-2021 – October 2021 - 28 -
TROUBLESHOOTING with the ENERGY MANAGER
Display Manager Error Codes and Faults
An error code on the display indicates that Display Manager has detected a problem.
E100: Temperature sensor is not working properly. This indicates that the Manager is in service board mode.
Circulator and inducer run constantly, burner runs off the high limit aquastat. All inputs turn on respective
outputs. If the sensor is not detected within ten minutes, the Manager will change to E190 mode.
E190: After ten minutes in E100 mode the Display Manager switches to E190 mode. This indicates that the Manager is
operating in Classic Manager Mode. The boiler will operate as cold start instead of maintaining temperature as
when in service board mode. When a thermostat calls, the system will pre-heat for two minutes before opening
the zone output and will post purge for whatever the zones max purge time is set.
Check Sensor wiring. Check sensor leads for loose connections or damage. If connections and wiring look
good, replace the sensor.
If Manager is left in this mode, set Dual Guard high limit to “Service Mode”.
E130: Excessive temperature condition. Zones could not extract heat from boiler. Check zone valves, heat exchanger
and boiler circulation. High limit aquastat may not be functioning.
E140: Boiler is in Freeze Protection Mode, Burner light off, Circulator light on, Heating zone outputs on. This means
that the boiler return temperature did not increase enough to open zones within 27 minutes.
Does Primary Control need to be reset?
YES: Troubleshoot as standard burner lockout.
NO: Did homeowner reset control?
YES: Troubleshoot as standard burner lockout.
NO: Reset Manager. Run through standard heat cycle.
Does boiler return heat up properly?
NO: Check circulator. Possible closed or blocked bypass. Look for a zone valve not holding.
YES: Intermittent problem. Check low voltage wiring for tightness from Manager through relay board
and cad cell relay to TT. Check line voltage at burner, in and out of cad cell relay. Check LWCO,
Check limit aquastat for proper operation. See if burner/main circulator relay is properly plugged
in and working properly.
E150: The return temperature did not reach 100°F after seven minutes. The manager will pulse the output of the calling
zone for one minute on and one minute off. If the return increases within 20 minutes, the system will continue to
run and supply heat while displaying the E150 code, indicating a boiler side blockage and that the manager is
operating in Classic Manager Mode. When a thermostat calls, the system will pre-heat for two minutes before
opening the zone output and will post purge for whatever the zone max purge time is set. If after 20 minutes the
return does not heat up, the Manager will change to E140 mode.
Sensor Fault: On power-up, or display wake-up, the display will briefly show the message: “Sensor Fault; Replace
Soon”. This indicates that one of the two dual thermistors is giving an invalid reading. Check to ensure that all
thermistor leads are securely connected and tightened on the left-hand side quick-connect. If the connections are
secure, and the message is still displayed on power-up or display wake-up, the thermistor should be replaced.
TO RESET MANAGER
The Manager can be reset to normal operation by turning the system switch off and back on.
WARNING: Do Not Jump! If you apply 24VAC to any temperature sensor lead with the sensor connected to
the Manager, you will burn out both the sensor and the Manager in less than a second.
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