Problem solving
RTG 199 ME – 6 720 811 615 (2015/04)
44
9
Problem solving
9.1
Error code diagnostics
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. 70, page 50). Go to steps two and
three to determine flue gas limiter fault and repair 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. Unplug heater and check that flue gas limiter connector and spade connections
are secure.
4. Check the wiring harness connections on the control board.
Wire harness defect.
1. Check wire harness.
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 backflow temperature sensor connection. See fig. 70, #14, page 50.
2. Replace exhaust temperature sensor.
3. Check sensor (ref. page 48, chapter 11).
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
necessary.
3. Check wire connections at outlet temperature sensor.
4. Check sensor (ref. page 48, chapter 11).
(Flashing)
Outlet temperature sensor not sensing
expected output temperature.
(Status message, not an error).
1. Check gas pressure, see chapter 4.14, page 32. Low gas pressure may prevent
the heater from reaching desired output temperature.
2. Check supply voltage. It must be 120VAC and properly grounded.
3. Check wire connections at outlet temperature sensor.
4. Possible defective control unit call manufacturer for further instructions.
Primary fan rotation too low in
operation.
1. Disconnect power supply cord and check wire connection on back side of fan and
the connectors on the control board.
2. Check supply voltage. It must be 120VAC and properly grounded.
3. Check venting specifications are met, see chapter 4.3, page 11. Long vent
lengths, venting with more than three elbows, blocked vent or combination
venting may cause this failure.
4. Ensure intake and exhaust terminations maintain the required clearances stated in
the manual. Cross contamination between intake and exhaust may cause the fan
to alter its rotational speed.
5. Check gas pressure. Low gas pressure may cause the fan to change its speed to
meet desired temperature.
6. Possible defective control unit call manufacturer for further instructions.
Table 41
* By installer or service technician only.
Summary of Contents for RTG 199 MEN
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