Boiler Control Instruction & Operation Manual
Page 5
6
of
68
Trouble- Shooting
Hard Lockouts (continued)
Lockout Number
Condition
Possible Cause
14
Delta T Inlet/Outlet High
The difference between the
inlet/return and the
outlet/supply temperature is
too large.
-
Inadequate boiler water flow
15
Return Temp Higher Than
Supply
The temperature of the
return/inlet is higher than the
temperature of the
supply/outlet
-
Water flow reversed
-
No flow, sensor reversed, sensor bad
16
Supply Temp Risen Too
Quickly
The supply/outlet temperature
has risen too quickly.
-
Water flow reversed
-
No flow, sensor reversed, sensor bad
18
Light off rate proving failed
Blower is not running at Light-
off rate when it should or
blower speed signal not being
detected
-
Heating load far below min
-
Bad pump or low primary flow
-
Boiler on with no zones on
19
Purge rate proving failed
Blower is not running at Purge
rate when it should or blower
speed signal not being
detected
-
Loose connection in 120 VAC blower wiring.
-
Loose or miswired blower speed harness.
-
Defective blower
20
Configuration Fault
Unacceptable Control Safety
related parameter detected.
(See display for details)
-
Safety Parameter verification required. Contact
factory.
21
Invalid Modulation
Parameter
Unacceptable Control
Modulation related parameter
detected.
-
Reset the control.
22
Safety data verification
needed
Safety related parameter
change has been detected and
verification has not been
completed.
-
Safety related Control parameter has been
changed and verification has not been performed.
23
24VAC voltage low/high
Control 24Vac control power is
high or low.
-
Loose connection in 24Vac VAC power wiring.
-
Loose or miswired 24Vac harness.
-
Miswired wiring harness causing power supply
short to ground.
-
Defective transformer.
-
Transformer frequency, voltage and VA do not
meet specifications.
24
Fuel Valve Error
Power detected at fuel valve
output
when fuel valve should be off.
-
Loose or defective gas valve harness. Check
electrical connections.
-
Defective gas valve (check for 24 Vac at harness
during trial for ignition before replacing valve).
25
Hardware Fault
Internal control failure.
(See display for details)
-
Reset the control. If problem reoccurs, replace
the Control.
26
Internal Fault
Internal control failure.
-
Reset the control. If problem reoccurs, replace
the Control.