Cut out a lot of the 'chaff' (reading MQTT values) and just posting the main control bit.
If you can see where it might be improved, please let me know.
[{"id":"bc981fa9ede7efd8","type":"mqtt out","z":"db9c45ab1920b2aa","name":"V100-W send","topic":"","qos":"0","retain":"false","respTopic":"","contentType":"","userProps":"","correl":"","expiry":"","broker":"0549f612016b7da9","x":1400,"y":280,"wires":[]},{"id":"7948976871eec50d","type":"function","z":"db9c45ab1920b2aa","name":"otgw set","func":"msg.topic = \"OTGW/set/otgw-500291FE3A1F/\" + msg.topic;\nmsg.payload = msg.payload;\ndelete msg.action;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1180,"y":660,"wires":[["6cb1f4976f19acd0","a650a549cee2b75c"]]},{"id":"6cb1f4976f19acd0","type":"debug","z":"db9c45ab1920b2aa","name":"debug 40","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":1180,"y":700,"wires":[]},{"id":"13cc42ea9fe075d2","type":"comment","z":"db9c45ab1920b2aa","name":"Div valve States *Notes","info":"Central Heating enable\nSet Temperature CS\nDiverter Valve BOTH on\n\nModulation should be automatic\n\nCentrol Heating enable\nSet Temperature CS\nDiverter Valve BOTH off\n\nOutside Temperature for Weather Compensation\n\nPS1 will fetch Status WORD\n\nPS=state\n Print Summary — The opentherm gateway normally prints every opentherm message\n it receives, as well as the modified messages it transmits. In some applications\n it may be more useful to only get a report of the latest values received for the\n most interesting parameters on demand. Issuing a \"PS=1\" command will stop the\n reports for each message and print one line with the following values:\n\n Status (MsgID=0) — Printed as two 8-bit bitfields\n Control setpoint (MsgID=1) — Printed as a floating point value\n Remote parameter flags (MsgID=6) — Printed as two 8-bit bitfields\n Cooling control signal (MsgID=7) — Printed as a floating point value\n Control setpoint 2 (MsgID=8) — Printed as a floating point value\n Maximum relative modulation level (MsgID=14) — Printed as a floating point value\n Boiler capacity and modulation limits (MsgID=15) — Printed as two bytes\n Room setpoint (MsgID=16) — Printed as a floating point value\n Relative modulation level (MsgID=17) — Printed as a floating point value\n CH water pressure (MsgID=18) — Printed as a floating point value\n DHW flow rate (MsgID=19) — Printed as floating point value\n CH2 room setpoint (MsgID=23) — Printed as a floating point value\n Room temperature (MsgID=24) — Printed as a floating point value\n Boiler water temperature (MsgID=25) — Printed as a floating point value\n DHW temperature (MsgID=26) — Printed as a floating point value\n Outside temperature (MsgID=27) — Printed as a floating point value\n Return water temperature (MsgID=28) — Printed as a floating point value\n CH2 flow temperature (MsgID=31) — Printed as a floating point value\n Boiler exhaust temperature (MsgID=33) — Printed as a signed decimal value\n DHW setpoint boundaries (MsgID=48) — Printed as two bytes\n Max CH setpoint boundaries (MsgID=49) — Printed as two bytes\n DHW setpoint (MsgID=56) — Printed as a floating point value\n Max CH water setpoint (MsgID=57) — Printed as a floating point value\n V/H master status (MsgID=70) — Printed as two 8-bit bitfields\n V/H control setpoint (MsgID=71) — Printed as a byte\n Relative ventilation (MsgID=77) — Printed as a byte\n Burner starts (MsgID=116) — Printed as a decimal value\n CH pump starts (MsgID=117) — Printed as a decimal value\n DHW pump/valve starts (MsgID=118) — Printed as a decimal value\n DHW burner starts (MsgID=119) — Printed as a decimal value\n Burner operation hours (MsgID=120) — Printed as a decimal value\n CH pump operation hours (MsgID=121) — Printed as a decimal value\n DHW pump/valve operation hours (MsgID=122) — Printed as a decimal value\n DHW burner operation hours (MsgID=123) — Printed as a decimal value \n\n A new report can be requested by repeating the \"PS=1\" command.\n Examples: PS=1, PS=0 ","x":140,"y":380,"wires":[]},{"id":"6d4f4277db295de3","type":"function","z":"db9c45ab1920b2aa","name":"Boiler enable","func":"msg.boilerPriority = global.get(\"boilerPriority\"); \nlet boilerHW = global.get('boilerHW');\nlet boilerCH = global.get('boilerCH')\n\nif (global.get('boilerHW') === 1 || global.get('boilerCH') === 1) {\n msg.boilerEnable = 1;\n return msg\n}\nelse if (global.get('boilerHW') === 0 && global.get('boilerCH') === 0) {\n msg.boilerEnable = 0;\n return msg;\n}\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":630,"y":400,"wires":[["c87f82178d782242"]]},{"id":"5fec53b602647ea6","type":"function","z":"db9c45ab1920b2aa","name":"Boiler temp","func":"msg.topic = \"ctrlsetpt\"\nmsg.payload = msg.boilerTemp;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":790,"y":580,"wires":[["353b0beab954830b","48035ed1e8f3a9d0"]]},{"id":"767fe991e487fa71","type":"function","z":"db9c45ab1920b2aa","name":"CH enable","func":"msg.topic = \"chenable\";\nmsg.payload = msg.boilerEnable;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":710,"y":620,"wires":[["353b0beab954830b","37390b0d07666bdf"]]},{"id":"9e48c404cc25999f","type":"function","z":"db9c45ab1920b2aa","name":"Desired deg","func":"msg.topic = \"constant\";\nmsg.payload = msg.boilerDesired;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":630,"y":720,"wires":[["073404090856389c","353b0beab954830b"]]},{"id":"b04134ee6035f01b","type":"function","z":"db9c45ab1920b2aa","name":"Modulation","func":"msg.topic = \"maxmodulation\";\nmsg.payload = msg.boilerModulation;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":790,"y":680,"wires":[["353b0beab954830b","9e48c404cc25999f"]]},{"id":"073404090856389c","type":"function","z":"db9c45ab1920b2aa","name":"Outside temp","func":"msg.topic = \"outside\";\nmsg.payload = msg.boilerOutside;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":790,"y":740,"wires":[["353b0beab954830b"]]},{"id":"37390b0d07666bdf","type":"function","z":"db9c45ab1920b2aa","name":"Command","func":"msg.topic = \"command\";\nmsg.payload = msg.boilerCommand;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":630,"y":660,"wires":[["353b0beab954830b","b04134ee6035f01b"]]},{"id":"cd31a44d6b2d8d30","type":"function","z":"db9c45ab1920b2aa","name":"Filter msg","func":"if (msg.payload !== undefined){\n return { payload: msg.payload, topic: msg.topic};\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":1020,"y":660,"wires":[["7948976871eec50d"]]},{"id":"48035ed1e8f3a9d0","type":"debug","z":"db9c45ab1920b2aa","name":"debug 55","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":980,"y":580,"wires":[]},{"id":"f689b258624c5635","type":"function","z":"db9c45ab1920b2aa","name":"Boiler temp","func":"let boilerTemp;\nlet boilerOutside = global.get('OutsideTemperature');\n\nif (msg.boilerEnable == 1){\n //Calculate Temperatures here to vary\n if (boilerOutside <= 10){\n boilerTemp = 56;\n }\n else if (boilerOutside < 20) {\n boilerTemp = 54;\n }\n else if (boilerOutside < 30) {\n boilerTemp = 48;\n }\n else\n {\n boilerTemp = 54;\n }\n msg.boilerTemp = boilerTemp;\n}\nmsg.boilerModulation = 100;\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":630,"y":580,"wires":[["5fec53b602647ea6"]]},{"id":"c87f82178d782242","type":"function","z":"db9c45ab1920b2aa","name":"Priority drivers","func":"let boilerCH = global.get(\"boilerCH\");\nlet chDesired = global.get(\"CHDesired\");\nlet lrTemp = global.get(\"incomingTemperature\");\nlet boilerHW = global.get(\"boilerHW\");\nlet hwDesired = global.get(\"HWDesired\");\nlet hotWater = global.get(\"HotWater\").toFixed(1);\nlet hwDemand = hotWater < hwDesired;\nlet chDemand = lrTemp < chDesired;\n/*\n No Power - B - 0\n White - AB - 1\n White & Grey - A - 2\n Grey - Hold - 3\n*/\nif (msg.boilerEnable === 1){\n if (msg.boilerPriority === 0){\n if ((boilerHW == 1) && (hotWater < hwDesired)){\n msg.demandHW = \"<\"\n msg.demandCH = \"-\"\n msg.boilerDivV = 0; \n msg.boilerOn = 1;\n msg.boilerEnable = 1;\n }\n else if ((boilerCH === 1) && (lrTemp < chDesired)) {\n msg.demandHW = \">\"\n msg.demandCH = \"<\"\n msg.boilerDivV = 2;\n msg.boilerOn = 1;\n msg.boilerEnable = 1;\n }\n else\n {\n msg.demandHW = \">\"\n msg.demandCH = \">\"\n msg.boilerDivV = 0;\n msg.boilerOn = 2;\n msg.boilerEnable = 0;\n }\n }\n else if (msg.boilerPriority === 1) {\n if ((boilerCH == 1) && (lrTemp < chDesired)) {\n msg.demandHW = \"-\"\n msg.demandCH = \"<\"\n msg.boilerDivV = 2;\n msg.boilerOn = 1;\n msg.boilerEnable = 1;\n }\n else if ((boilerHW === 1) && (hotWater < hwDesired)) {\n msg.demandHW = \"<\"\n msg.demandCH = \"-\"\n msg.boilerDivV = 0;\n msg.boilerOn = 1;\n msg.boilerEnable = 1;\n }\n else\n {\n msg.demandHW = \">\"\n msg.demandCH = \">\"\n msg.boilerDivV = 0;\n msg.boilerOn = 2;\n msg.boilerEnable = 0;\n }\n }\n}\n\nelse {\n msg.demandHW = \"-\"\n msg.demandCH = \"-\"\n msg.boilerDivV = 0;\n msg.boilerTemp = 10;\n msg.boilerOn = 2;\n msg.boilerEnable = 0;\n}\n\nmsg.boilerDesired = chDesired;\nglobal.set(\"boilerDivV\", msg.boilerDivV);\n//msg.test = boilerCH + \" | \" + lrTemp + \" | \" + chDesired + \" | \" + boilerHW + \" | \" + hotWater + \" | \" + hwDesired;\nnode.status({ text: msg.boilerPriority + \" | \" + msg.boilerDivV + \" | \" + boilerCH + \" | \" + lrTemp + \" | \" + chDesired + \" | \" + msg.demandCH + \" | \" + boilerHW + \" | \" + hotWater + \" | \" + hwDesired + \" | \" + msg.demandHW});\nreturn msg","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":800,"y":400,"wires":[["5358f4718995195f","ed445c56b3f2e121","f689b258624c5635","767fe991e487fa71"]]},{"id":"498bf511e8cf4f87","type":"function","z":"db9c45ab1920b2aa","name":"Diverter v/v","func":"let boilerDivV = msg.boilerDivV\nlet Sonoff1 = \"cmnd/DivV/CH_on/POWER\";\nlet Sonoff2 = \"cmnd/DivV/HW_OK/POWER\";\n\n/*\n No Power - B - 0\n White - AB - 1\n White & Grey - A - 2\n Grey - Hold - 3\n*/\nlet msg1;\nlet msg2;\nlet msg3;\n\nif (msg.boilerOn === 2){\n boilerDivV = 4\n}\n\nswitch (boilerDivV) {\n case 1: //CH ON (AB)\n msg1 = {topic: Sonoff1, payload: \"on\"} //White\n msg2 = {topic: Sonoff2, payload: \"off\"} //Grey\n msg3 = { topic: \"boilerOn\", payload: 1 } //Grey\n return [msg1, msg2, msg3]\n break;\n case 2: //HW OK (A)\n msg1 = { topic: Sonoff1, payload: \"on\" } //White\n msg2 = { topic: Sonoff2, payload: \"on\" } //Grey\n msg3 = { topic: \"boilerOn\", payload: 1 } //Grey\n return [msg1, msg2, msg3]\n break;\n case 3: //HOLD (~~)\n msg1 = { topic: Sonoff1, payload: \"off\" } //White\n msg2 = { topic: Sonoff2, payload: \"on\" } //Grey\n msg3 = { topic: \"boilerOn\", payload: 1 } //Grey\n return [msg1, msg2, msg3]\n break; \n case 4: //Boiler OFF (B)\n msg1 = { topic: Sonoff1, payload: \"off\" } //White\n msg2 = { topic: Sonoff2, payload: \"off\" } //Grey\n msg3 = { topic: \"boilerOn\", payload: 0 } //Grey\n return [msg1, msg2, msg3]\n break;\n\n default: //OFF (B)\n msg1 = { topic: Sonoff1, payload: \"off\" } //White\n msg2 = { topic: Sonoff2, payload: \"off\" } //Grey\n msg3 = { topic: \"boilerOn\", payload: 1 } //Grey\n return [msg1, msg2, msg3]\n break;\n}","outputs":3,"noerr":0,"initialize":"","finalize":"","libs":[],"x":730,"y":520,"wires":[["b76bd807a25169b6"],["b76bd807a25169b6"],["b76bd807a25169b6"]]},{"id":"e42e62205a291806","type":"switch","z":"db9c45ab1920b2aa","name":"Div 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