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46
Problem solving
8
Problem solving
8.1
Error code diagnostics
i
To remove error code from the
display, press the reset button.
Display
Cause
Solution
Fault in the flue gas limiter.
Temperature above 230°F
(110°C) inside the cabinet.
1. Check continuity of the flue gas limiter (see Fig.
73
, page
53
).
Go to steps two and three to determine air box temperature
sensor fault and replace it.
2. Check for flue gas leakage around the top and bottom seals of
heat exchanger use mirror to check around the rear as well as the
viewing window.
3. Check that flue gas limiter connector and spade connections
are secure.
4. Unplug heater and check the wiring harness connections inside
the control board.
Wire harness defect.
1. Check wire harness, see
page 60
- item 7.
2. Measure resistence loose on wire harness nearby the
overmolding, must be 115 - 120 ohm.
3. Check diagnostic menu > 1P, “nC” must be showed on the
display.
Backflow temperature sensor
defect - happens if sensor is
disconnected or short circuit.
1. Check blackflow temperature sensor connection. See
Fig. 73
,
page
53
.
2. Replace backflow temperature sensor.
3. Check sensor (ref.
page 51
,
chapter 10
).
Outlet temperature sensor fault
(Temperature below 36°F or above
210°F).
1. Sensor may trip if water temperature drops below 36°F to
protect heater from freezing conditions. Any damage due to
freezing conditions is not covered under warranty.
2. In areas where water has a high mineral content, periodic
descaling may be necessary.
3. Check sensor (ref.
page 51
,
chapter 10
).
Table 31
* By installer or service technician only.