A.O. Smith TWI 35-200, Installation, User And Service Manual

Page: 74 / 92

Indication Cause Measure
Water leakage There is a leakage from a threaded
water connection. Tighten the threaded connection.
There is a condensate leakage Make sure that the condensation water
discharge is working properly.
If necessary, correct the water discharge.
There is a leakage from another nearby
water heater or pipe segment. Trace the leakage.
There is a leakage from the water heater
tank. Contact the supplier of your water heater.
Explosive ignition The gas supply pressure is incorrect. Check the gas supply pressure, refer to Gas
supply pressure.
The CO
2
value is incorrect. Check the CO
2
value, refer to CO
2
value
(see 8.9.4).
The burner is contaminated. Clean the burner, refer to Gas-side
maintenance (see 11.4).
There is an air leakage between the
venturi and the air connector. Make sure that:
- the air connector is not damaged.
If necessary, replace the air connector.
- the air connector is correctly
connected to the venturi.
If necessary, tighten the clamp.
The air inlet filter is contaminated. Clean the air inlet filter (see 11.4.3).
Insufficient or no
hot water The water heater is off. Turn on the water heater (see 4.1).
There is no supply voltage. Make sure that:
the control switch is set to I.
the isolator is in ON position.
there is power on the isolator.
there is power to the electrical connector
block.
The measured voltage must be
230 V
AC
(-15%, +10%).
The hot water supply is used up. Reduce the hot water consumption. Wait
until the water heater heats up.
The controller is in the OFF mode. Set the controller in the ON mode.
The setpoint is set too low. Set the setpoint to a higher value.
The external ON mode switch is not
enabled. Set the "External use Enabled" to Yes. (see
10.5.1)
74 Installation, Maintenance and Service part