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Hi everyone, have an interesting one, been working with Hrm there support as always is helpful, but has drawn a loss. Changed Nrv with a non specific thos caused a draw issue so replaced with hrm direct one. Full service as normal. The problem is startup and lockout, the system has to be fully purged everytime closing off the oil supply till control box clicks and no more heat or smoke then when you engage oil the negative pressure draws through oil vapour spread then ignites and it runs. Then will run next time but lock out. Previous work over half yeat has seen replaced stem valve and solenoid as well as diveter valve, diaphragm and microswitch. Have reset electrode and cleaned up in an effort to check. This maybe control box but would like other people's ideas please.
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