My gas Weil McLain Aquabalance 120 WMB120 combi is two years old. I have been getting an A02 false flame indication error code with a hard lock out. I initially cleaned and re-installed the ignitor electrode. Problem continued. I replaced the part and again the problem persists. After re-setting the unit will operated both DHW and heat for 12 to 24 hours, cycling on and off, then go into A02 mode. Please help.
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