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68

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 first installed into the Option Panel, the Option Panel automatically 

“Learns” the card.  This means it detects the specific 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 floating decimal point that flashes on and off (the “heartbeat” 

flash 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. 

Summary of Contents for MPO-IQ

Page 1: ...n on boiler provide Boiler Model Number and Serial Number as shown on Rating Label Boiler Model Number MPO IQ Boiler Serial Number Installation Date Heating Contractor Phone Number Address As an ENERG...

Page 2: ...oke and unburned fuel to pass out of the combustion chamber and clog the flueways of the boiler 8 COLD OIL If the oil temperature approaching the fuel pump is 40 F or lower poor combustion or delayed...

Page 3: ...osed Note The Safety Monitoring Circuit SMC is designed to provide lockout in the event of a stuck or welded motor relay C IQ OIL BOILER CONTROL When a problem occurs with the boiler operation the IQ...

Page 4: ...ce control if problem persists Err 8 Manual Reset Lockout resettable Set if Err 4 was invoked four times in a row Check wiring and clear Lockout by pressing all three user keys for 30 seconds XIII TRO...

Page 5: ...uel supply lines and filter for obstructions ErP 10 No Ignition Check Ignition Transformer The burner was not lit and spark was not detected Check the electrodes spring contacts or high voltage wires...

Page 6: ...iring ErP 84 LWCO Option Card Low Water Event Low water level Limit has caused the boiler to shutdown Make sure that the water level has reached the probe Limit will re close automatically after water...

Page 7: ...Water DHW Priority Forcing Circulator Off When there is a DHW heat request wired to the boiler control s ZR terminal the System Circulator will be forced off for the duration of the DHW heat request...

Page 8: ...heck fuel lines and filter are free of obstructions Check fuel lines are fully purged of air Use the pump priming feature to purge the system of air Check that the burner motor is spinning and the pum...

Page 9: ...install 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 Pan...

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