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38
X-2
Installation, Operating & Service Manual
4. Use
STA
(STATUS) Number To Guide Troubleshooting.
The control will flash “
STA
” followed by a number. Use this number to identify the boiler problem in table below:
2. Circulator is On, But Boiler is Off
Display / Status
Recommended Corrective Action
STA1
Circulator
Pre-purge
Burner off
Circulator on
Boiler is warm and circulator is providing residual boiler heat to building:
Check boiler temperature
- Boiler will not start until boiler water temperature is less than Setpoint (
SP
) minus
differential (
df
)
- If boiler water temperature is higher than Start Temperature (
ST_
, default = 140°F) and
Circulator Pre-purge (
PP_
, default = 2 minutes) time has not expired, boiler start will be delayed
until water temperature drops or time expires. To permit boiler to start sooner, increase Start
Temperature parameter. Refer to Operation Section for additional information.
4. Circulator is On But Damper is Not Open
Display / Status
Recommended Corrective Action
STA15
Limit Open
Waiting for Limit to Open.
- Check Blocked Vent Switch, in event of a blocked vent or poor draft condition, the blocked vent
switch will open interrupting power to control P5-4. Main burners will be extinguished
immediately and circulator will remain on until the thermostat is turned off. Source of
blockage must be corrected by trained and skilled personnel from a qualified service agency before
resetting switch.
Blocked Vents are caused by a collapsed chimney resulting in full or partial blockage, chimney cross
sectional area too small, height insufficient or cold chimney causing sustained poor draft. Always
follow recommended clearances, combustion air requirements and venting requirements.
- Check Flame Rollout Switch, in event of excessive blockage of boiler section flue passageways is developed.
Flame rollout switch will open interrupting power to control P5-4. Main burners will be extinguished immediately
and circulator will remain on until thermostat is turned off. If flame rollout switch is activated, do not
attempt to place the boiler in operation.
Source of blockage must be corrected and identical flame rollout switch replaced by
trained and skilled personnel from a qualified service agency.
- Check External Limit.
3. Boiler is On, But Circulator is Off
Display / Status
Recommended Corrective Action
StA 8
Burner on
Circulator off
Domestic Hot Water (DHW) Priority Forcing Circulator Off
- When there is a DHW heat request wired to Control’s DHW terminal, System Circulator will be
“forced off” for duration of the DHW heat request. When DHW heat request ends, System
Circulator “force off” is removed, circulator can respond normally. When Priority Time, (
PT_
)
Parameter is set to “
ff
”, System Circulator is not “forced off” for a DHW call for heat.
Wiring / Circulator Issue:
- Check wiring for loose connection, miswiring
- Check circulator
1. Boiler and Circulator Off
Display / Status
Recommended Corrective Action
STA1
Standby
Burner off
Circulator off
Boiler has not detected a call for heat (
tt
=
ff
and dh =
ff
).
Check that thermostat:
- When a thermostat call for heat is detected, control display “
tt
” will show “
n
”
- Make sure thermostat is calling for heat and contacts (including appropriate zone controls) are closed.
- Check for loose connection.
Check DHW demand:
- When a domestic call for heat is detected
“
dh
” will show “
n
”
- Make sure the DHW aquastat contact is closed. Check for loose connection.
15
Troubleshooting
(continued)
