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Possible cause
Solution
E0: Water outlet
temperature sensor fault
Temperature sensior or
system failure.
Insufficient fuel supply to
start operation.
Low gas inlet pressure.
Flame sensor or system
failure.
Flame sensor or system
failure.
Thermostator system fault.
Temperature sensior or
system failure.
Exhaust Blockage.
High winds blowing on
exhaust.
Air switchorfan Fault.
Cold water surge in
system.
Cold water mix ratio.
Insufficient water supply.
Check the water outlet temperature wires connection if
loosen, tighten it. If not, maybe outlet temperature sensor
failure, replace it.
Confirm all gas valves are open, and restart the appliance
4-5 times (First time for using).
Confirm adequate fuel in tanks.
Check regulator for operation, replace if needed.
The flame sensor induction or PCB board is broken, need to
be replaced one of them.
PCB main control board failure or program faulty.
Replace main control board.
When E3 error displays, let cold water flow 10~20S then
restart the appliance. If E3 still displays, check the water flow
if too low, if not, check the thermostat if broken.
Check the water outlet temperature wires connection if loosen,
tighten it. If not, maybe outlet temperature sensor failure,
replace it.
Remove obstruction, then restart the appliance.
Move or re-orient coach soexhaust is not facing high winds,
then restart the appliance.
Check the air switch or fan if broken.
Reduce toilet flushes and amount of cold water faucets
opened during operation.
Reduce temperature setting to reduce cold water mix ratio.
Check for shower head and outdoor faucet valves leaking
cold water to hot side.
Confirm water tank is full or city water valve fully open.
Air in water lines-continue to run all faucets, hot and cold,
open until air purged.
E1: Flame sense fault
E2: Detected fake flame
signal
E3: Over temperature
mechanical sensor fault
E4: Water inlet temperature
sensor fault
E5: Air pressure fault
E6: Temperature Surge
alarm
Error Code
Insufficient water flow.
Temperature sensor or
systemfault.
Solenoid valve or system
fault.
Filter plugged- review "Cleaning and Maintenance" section
of this manual.
Low flow faucets - check that the minium flow is 0.32gpm.
Replace the out let temperature or main PCB control board.
Check the solenoid valve wires connection if loosen or broken.
E7: Solenoid valve fault
