10 - user interface quick reference – Dunkirk Q95M-200 Modulating Condensing Boiler User Manual

Page 22

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STANDBY MODE - BOILER SEQUENCE DISPLAY

After display shows Stby for a brief period, first character shows boiler status, followed by boiler outlet water temp. If the burner is

being held off due to a soft lockout, the display alternates between showing “9” followed by boiler outlet water temp. and “b” followed

by the two-digit codes below. Soft lockout means the boiler will start again automatically if the condition is corrected or timed out.

Press [

RESET] button to restart boiler without waiting for timeouts below.

First

Digit

Other

Digits

Boiler Status

0

Actual (measured) outlet water temperature

Standby - no call for heat

1

Pre-purge (10 seconds) or Post-purge

(15 seconds)

2

Ignition

3

Burner on for CH heating

4

Burner on for DHW heating

5

Checking airflow before pre-purge

6

Burner off because temperature setting

has been reached

7

Pump on after CH heating cycle for run-

on of 10 seconds

8

Pump on after DHW heating cycle for

run-on of 30 seconds

H

Burner on, running in high fire mode

(manually set for test)

L

Burner on, running in low fire mode

(manually set for test)

First

Digit

Code

#

Boiler is in soft lockout when “9” or “b” shown. Reason for

boiler soft lockout is:

“9”

alternating with

“b”

_18 Outlet temp. too high (over 203°F). Burner off until outlet water

temp. drops 9°F below target temp.

_19 Return temp. too high (over 203°F). Burner off until both outlet

and return water temp. drops 9°F below target temp.

_24 Return temp. higher than supply temp. Burner off waiting for

correction.

_25 Outlet water temp. rose too quickly. Burner off 10 min. (burner

recycles, increasing wait 1 min. each attempt to max. 15 min.)

_26

External limit open, LWCO tripped or 3.5” press switch open on

limit wired in soft lockout (auto reset) circuit. Burner off for 2½

minutes.

_29 Blower signal not 0 when it should be. Burner off until signal

condition terminates.

_30

Temp. rise across boiler more than 100°F. Burner off for 2½

minute wait (plus 1 minute for each failed attempt, up to max. of

22 minutes each time).

_61 Air pressure switch does not open.

_65 Waiting for blower to start.

10 - USER INTERFACE QUICK REFERENCE

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