Troubleshooting Guidelines; Lockouts; Soft Lockout; Hard Lockout - John Wood RESIDENTIAL GAS WATER HEATERS Installation And Operating Manual

These guidelines should be utilized by a qualifi ed 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.
46

TROUBLESHOOTING GUIDELINES

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IGNITION STATE AND TIMING

IGNITION STATE
5 seconds (NG models)
Pre-purge
15 seconds (LP models)
Hot Surface Igniter
10 seconds
(HSI) Warmup
Ignition Activation
3.5 seconds maximum
Period (IAP)
Flame Recognition
0.5 second
Period (FRP)
Trial For Ignition IAP + FRP
Flame Stabilization
Not Applicable
Period
Inter-purge 30 seconds
Flame Failure 2 seconds max
Response Time (@ 1uA fl ame current)
Post-purge 30 seconds
Pressure Switch (PS)
2 minutes
Prove Period
Pressure Switch (PS)
Fault Delay (failed 2 minutes
open/closed)
Soft Lockout 20 minutes
Energy Cut Off
Indefi nite
(ECO) Limit Lockout
TIMING
328126-000