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TROUBLESHOOTING GUIDELINES
These guidelines should be utilized by a qualified service
agent.
LOCKOUTS
Soft Lockout
•
Occurs when a system safety device trips to break the
sequence of operation. The control will try to start the
system in a timed basis but will not reinstate operation
until the failure is corrected.
Hard Lockout
•
Occurs when the main controller fails and must be
replaced.
RESETTING THE HEATER CONTROL
•
Soft lockouts as diagnosed by the system error codes
require the gas control to be reset.
•
To reset the control, slide the "ON/OFF" switch to the
"OFF" position. Wait for 10 seconds and move the
switch back to the "ON" position.
•
If the problem that caused the control to lock out has
not been corrected, the control will remain or again go
back into lockout.
100304522_2000545236 _Rev. 02
IGNITION STATE AND TIMING
IGNITION STATE
Pre-purge
Hot Surface Igniter
(HSI) Warmup
Ignition Activation
Period (IAP)
Flame Recognition
Period (FRP)
Trial For Ignition
Flame Stabilization
Period
Inter-purge
Flame Failure
Response Time
Post-purge
Pressure Switch (PS)
Prove Period
Pressure Switch (PS)
Fault Delay (failed
open/closed)
Soft Lockout
Energy Cut Off
(ECO) Limit Lockout
www. lochinvar .com
TIMING
5 seconds (NG models)
15 seconds (LP models)
10 seconds
3.5 seconds maximum
0.5 second
IAP + FRP
Not Applicable
30 seconds
2 seconds max
(@ 1uA flame current)
30 seconds
2 minutes
2 minutes
20 minutes
Indefinite
55
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