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There are three filters in the RHFE-1004A. The lamp indicates the two air filters need to be cleaned. Turn off the heater. Then pull the filters up from the back of the top of the unit (the side against the wall). Vacuum or dust both sides of each filter. If you notice that the filters are greasy, clean them by washing them quickly with detergent. Rinse the filters completely and then allow them to dry before reinstalling them. (The last filter is above the humidifier water tray.)
Ben, just because the heater was recently service, doesn't mean the filter may have gotten dirty from use, since then. Or the filter was overlooked during servicing.
In either case, turn the electrical part of the heater OFF and unplug it from the wall receptacle. Remove the filter and clean it, if necessary. Reinstall the filter properly, plug the unit back in and turn the Master ON/OFF switch to ON. Start the heater and the Filter Clean Light should not glow.
navigate to tradesmart, space heating, energysavers.
Red filter light means the filter is blocked.
its located directly on the back of the heater and the wall spacer, from the control panel, its about 4 inches back.
Pull it up, clean reinstall
I had the identical trouble with my Rinnai 431F just now & read the unanswered posts.
I checked my intake & exhaust & found them connected & intact then went out to check the exterior vent assembly. The "bell" or dome was almost entirely clogged with ice.
I suspect the 60 - 76 lights flashing means insufficient combustion air.
Anyway, I took a hair dryer to it & in 10 minutes it was working as well as ever.
This won't help you October posters but if anyone else has this problem in the future I would start with the outside vent assembly. Get a good look right up inside because I would have missed this ice if I didn't get up close with a flashlight.
I may not be much help here in the states but if you have the owners manual you will find a page that will tell you what the error code represents. Not knowing and unable to find the NZ error codes, most likely it represents a flame failure. You will need to remove the front cover and inspect the flame as it starts. If it starts and goes out quickly, you may have debris attached to the flame rod not allowing it to get the proper signal. Or you may have a spider web in your burner. These units are not eazy to repair and I strongly suggest you call a proffessional. Sorry.