Problem solving
RTG 199 HE – 6 720 811 617 (2016/01)
47
F9
Gas Control error
1. Check Gas Valve cable harness (connection to gas valve and to ECU)
2. Check Gas Valve (Replace if necessary)
3. Replace ECU (Electronic Control Unit)
F7
Ionization error at standby.
1. Loose connection to the flame ionization rod. Verify that the thinner wire leading
from the control unit is securely connected to the set of electrodes located on the
lower front of the heat exchanger.
2. Flame ionization rod or control unit may be damaged. Contact manufacturer for
further instruction.
FA
Gas leakage error, gas valve circuit
not closing properly.
1. Disconnect power supply cord and check wire connections on gas valve and the two
connectors on the control board.
2. Flow water out of a hot water tap above the minimum activation point of 0.5 GPM.
Measure voltage at the gas valve wire plug connection. The voltage should measure
24VDC between the left pair of wires and 24VDC between the right pair of wires
when the unit is operating. If voltage is not proper, contact manufacturer for further
instruction.
3. Gas valve may be defective, contact manufacturer for further instruction.
Display
Cause
Solution
Table 49
* By installer or service technician only.
Summary of Contents for RTG 199 HEN
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