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Rinnai Corporation ES38 Manual 
 
13 
  Troubleshooting 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Problem
Remedy
Cause
Not Plugged In
Power Failure
(Initial Installation)
Air In Gas Pipe
Gas Filter Blocked
Miss Ignition
Flue terminal obstructed
Flue manifold not connected
Louver obstructed
Air filter blocked
Gas Escape
Function Lock Set
Gas turned off at meter, tank,
or valve.
Plug In
Push On/Off button to attempt
restart after power is restored.
Purge air
(Installer)
Service Call
Service Call
Clear obstruction
Service Call
Clear obstruction
Clean filter
Service Call
Cancel Function Lock
Turn gas on
No ON
 i
n
di
cator
B
u
rn
er do
es
n
’t 
ig
ni
te
U
n
u
s
ual co
mbu
s
ti
on
Comb
usti
on
 st
o
p
s
d
u
ring o
pera
ti
o
n
Sm
e
ll o
f g
a
s
N
o
isy ignit
ion
T
a
kes to
o lo
ng
 to
w
a
rm the 
room
If the appliance fails to ignite, the appliance will attempt ignition after 1 hour.  The “Ignition Failure” fault code, 11, 
will appear during that hour and disappears after a successful ignition.  If ignition fails again, then the fault code 
will remain and another attempt to ignite will occur in 1 hour.  The fault code is not stored in the fault code history.   
If the flame is extinguished during forced combustion then the appliance will attempt ignition after 1 hour.  The 
“Ignition Failure” fault code, 11, will appear during that hour and disappears after a successful ignition.  Forced 
combustion takes place for about 15 seconds after ignition.  After this time, the temperature control logic controls 
the combustion. 
If the flame is extinguished (burner combustion failure) while the temperature control logic is operating the 
appliance, then the appliance will immediately attempt ignition.  No fault code will appear. 
  Restart 
Function