MPO-IQ Installation, Operating, and Service Instructions

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XIII. TROUBLE SHOOTING (continued)
G. USE OPTION PANEL DISPLAY TO DIRECT TROUBLESHOOTING
If Boiler Control Shows Status Code “STA 15": The Boiler Control is “Waiting for Limit to Close and Option Panel display
(display to right) will show one of the following status codes:
Option Panel Display Shows "Err"
Display Status Boiler / Control Action(s)
Err 1 Low Input Voltage AC voltage is too low
Err 2 - card #
Option Card
Type Change
without Re-Learn
Whenever a new Option Card is rst installed into the Option Panel, the Option Panel automatically
“Learns” the card. This means it detects the specic card and lists it as a card number (C1, C2, or
C3). However, to help avoid errors or unauthorized option card changes, once an Option Card is
initially installed, the Option Panel will not automatically “Learn” a different card in the same slot. In
this situation, the Option Panel has to “Learn” about the new card manually. To have the Option Panel
recognize or “Learn” about a different card, the user must press the “I” key on the Option Panel until
“Lrn” is displayed. Then press and hold either the Up ñ or Down ò key for at least three (3) seconds.
The Option Panel will then recognize and “Learn” the new Option Card.
Err 3 - card #
Option Card
Communications
Error
The Option Card is not installed properly or has an internal fault. Remove the card and check for bent
Option Panel card interface pins. Straighten bent or misaligned pins or choose another card slot and
reinstall card. If problem persists, replace card.
Err 4 - card #
Option Card
Hardware
Interface Error
The Option Card is not installed properly, there is a option card or Option Panel fault. Remove the card
and check for bent Option Panel card interface pins. Straighten bent or misaligned pins or choose
another card slot and reinstall card. If problem persists, replace card.
Err 5
Limit Output OFF
in ON State
Check limit string wiring, replace the Option Panel.
Err 6 Incorrect Wiring Check boiler wiring.
Err 7
Internal Option
Panel Error
Replace the Option Panel.
Err 8
Limit Output ON
in OFF State
Check limit string wiring, replace the Option Panel.
Err 9
Hard Lockout
Due to Repeated
Err 8
Check limit string wiring, replace the Option Panel.
If Option Panel Display Shows “OL": The OL- “card number” indicates the card slot causing the Open Limit. For
example, “OL-C1" means open limit in the card located in card slot 1. To determine the cause of the open limit the user
must switch the display on the Option Panel to show the view mode of the Option Card installed in Slot 1.
For example, if, while the boiler has a Heat Request, and the Aquastat Option Card installed in Slot 1 has a sensor failure
the Option Panel displays OL-C1 (Open Limit Card Slot 1). To investigate the status of option card C1:
1. Press the “I” key on the Option Panel. The display will go from “OL-C1” to C1 .
2. When the display shows C1, press either the Up ñ or Down ò keys to switch the display to show the view mode of
the Aquastat Limit Control Option Card inserted in Slot 1. The display will now read Err119, Sensor Failure.
3. Check the sensor connections and when required replace the sensor.
4. When the sensor failure is corrected the Option Panel will return to the “O.C.P" display and the control start
sequence will continue.
For additional information refer to the instruction manual supplied with the Option Card.
If Option Panel Display Shows “O.C.P": The Option Panel is in normal run or operating mode, the Option Panel
display will show “O.C.P" (Option Card Panel) along with a oating decimal point that ashes on and off (the “heartbeat”
ash indicating the panel is functioning properly and there are no open limits or errors). The Option Panel or the Option
Card installed in the Option Panel are not causing the open limit.